Migrate altTitle to Set<String>

build.gradle

@@ -58,10 +58,10 @@ afterEvaluate {
 }
 
 dependencies {
-	implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.9.0'
+	implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.1'
 	implementation 'com.squareup.okhttp3:okhttp:4.12.0'
-	implementation 'com.squareup.okio:okio:3.9.0'
-	api 'org.jsoup:jsoup:1.18.1'
+	implementation 'com.squareup.okio:okio:3.10.2'
+	api 'org.jsoup:jsoup:1.18.3'
 	implementation 'org.json:json:20240303'
 	implementation 'androidx.collection:collection:1.4.5'
 
@@ -70,7 +70,7 @@ dependencies {
 	testImplementation 'org.junit.jupiter:junit-jupiter-api:5.10.1'
 	testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.10.1'
 	testImplementation 'org.junit.jupiter:junit-jupiter-params:5.10.1'
-	testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.3'
+	testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.10.1'
 	testImplementation 'io.webfolder:quickjs:1.1.0'
 }
 

buildSrc/build.gradle

@@ -14,5 +14,5 @@ dependencies {
 	implementation gradleApi()
 	implementation 'org.simpleframework:simple-xml:2.7.1'
 	implementation 'com.soywiz.korlibs.korte:korte-jvm:4.0.10'
-	implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.9.0'
+	implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.1'
 }

src/main/kotlin/org/koitharu/kotatsu/parsers/model/Manga.kt

@@ -14,9 +14,9 @@ public data class Manga(
 	 */
 	@JvmField public val title: String,
 	/**
-	 * Alternative title (for example on other language), may be null
+	 * Alternative titles (for example on other language), may be empty
 	 */
-	@JvmField public val altTitle: String?,
+	@JvmField public val altTitles: Set<String>,
 	/**
 	 * Relative url to manga (**without** a domain) or any other uri.
 	 * Used principally in parsers
@@ -140,7 +140,7 @@ public data class Manga(
 	) : this(
 		id = id,
 		title = title,
-		altTitle = altTitle?.nullIfEmpty(),
+		altTitles = setOfNotNull(altTitle?.nullIfEmpty()),
 		url = url,
 		publicUrl = publicUrl,
 		rating = rating,
@@ -162,6 +162,13 @@ public data class Manga(
 	public val author: String?
 		get() = authors.firstOrNull()
 
+	/**
+	 * Alternative title (for example on other language), may be null
+	 */
+	@Deprecated("Please use altTitles")
+	public val altTitle: String?
+		get() = altTitles.firstOrNull()
+
 	/**
 	 * Return if manga has a specified rating
 	 * @see rating

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/BatoToParser.kt

@@ -7,8 +7,8 @@ import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.exception.ParseException
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
@@ -334,7 +334,7 @@ internal class BatoToParser(context: MangaLoaderContext) : LegacyPagedMangaParse
 			Manga(
 				id = generateUid(href),
 				title = title,
-				altTitle = div.selectFirst(".item-alias")?.text()?.takeUnless { it == title },
+				altTitles = setOfNotNull(div.selectFirst(".item-alias")?.textOrNull()?.takeUnless { it == title }),
 				url = href,
 				publicUrl = a.absUrl("href"),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/ComickFunParser.kt

@@ -7,8 +7,8 @@ import org.json.JSONArray
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.*
@@ -152,7 +152,7 @@ internal class ComickFunParser(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(slug),
 				title = jo.getString("title"),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = slug,
 				publicUrl = "https://$domain/comic/$slug",
 				rating = jo.getDoubleOrDefault("rating", -10.0).toFloat() / 10f,
@@ -179,12 +179,12 @@ internal class ComickFunParser(context: MangaLoaderContext) :
 		val url = "https://api.$domain/comic/${manga.url}?tachiyomi=true"
 		val jo = webClient.httpGet(url).parseJson()
 		val comic = jo.getJSONObject("comic")
-		val alt = comic.getJSONArray("md_titles").asTypedList<JSONObject>().joinToString("\n") {
-			it.getStringOrNull("title").orEmpty()
+		val alt = comic.getJSONArray("md_titles").asTypedList<JSONObject>().mapNotNullToSet {
+			it.getStringOrNull("title")
 		}
 		val author = jo.getJSONArray("artists").optJSONObject(0)?.getStringOrNull("name")
 		return manga.copy(
-			altTitle = alt.nullIfEmpty(),
+			altTitles = alt,
 			contentRating = if (jo.getBooleanOrDefault("matureContent", false)
 				|| comic.getBooleanOrDefault("hentai", false)
 			) {

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/ExHentaiParser.kt

@@ -13,8 +13,8 @@ import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.exception.AuthRequiredException
 import org.koitharu.kotatsu.parsers.exception.TooManyRequestExceptions
 import org.koitharu.kotatsu.parsers.model.*
@@ -173,7 +173,7 @@ internal class ExHentaiParser(
 			Manga(
 				id = generateUid(href),
 				title = rawTitle.cleanupTitle(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = a.absUrl("href"),
 				rating = td2.selectFirst("div.ir")?.parseRating() ?: RATING_UNKNOWN,
@@ -213,7 +213,7 @@ internal class ExHentaiParser(
 
 		return manga.copy(
 			title = title?.getElementById("gn")?.text()?.cleanupTitle() ?: manga.title,
-			altTitle = (title?.getElementById("gj")?.text()?.cleanupTitle() ?: manga.altTitle)?.nullIfEmpty(),
+			altTitles = setOfNotNull(title?.getElementById("gj")?.text()?.cleanupTitle()?.nullIfEmpty()),
 			publicUrl = doc.baseUri().ifEmpty { manga.publicUrl },
 			rating = root.getElementById("rating_label")?.text()
 				?.substringAfterLast(' ')

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/HitomiLaParser.kt

@@ -11,9 +11,9 @@ import org.json.JSONArray
 import org.json.JSONObject
 import org.jsoup.Jsoup
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.getStringOrNull
@@ -528,7 +528,7 @@ internal class HitomiLaParser(context: MangaLoaderContext) : LegacyMangaParser(c
 						tags = emptySet(),
 						contentRating = ContentRating.ADULT,
 						rating = RATING_UNKNOWN,
-						altTitle = null,
+						altTitles = emptySet(),
 						state = null,
 						source = source,
 					)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/ImHentai.kt

@@ -7,8 +7,8 @@ import kotlinx.coroutines.coroutineScope
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -122,7 +122,7 @@ internal class ImHentai(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(domain),
 				coverUrl = a.selectFirst("img")?.src(),
 				title = div.selectFirst(".caption")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -200,7 +200,7 @@ internal class ImHentai(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(domain),
 				coverUrl = a.selectFirst("img")?.src(),
 				title = div.selectFirst(".caption")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/LineWebtoonsParser.kt

@@ -6,9 +6,9 @@ import okhttp3.HttpUrl
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.exception.NotFoundException
 import org.koitharu.kotatsu.parsers.exception.ParseException
 import org.koitharu.kotatsu.parsers.model.*
@@ -126,7 +126,7 @@ internal abstract class LineWebtoonsParser(
 				Manga(
 					id = generateUid(titleNo),
 					title = jo.getString("title"),
-					altTitle = null,
+					altTitles = emptySet(),
 					url = "$titleNo",
 					publicUrl = "https://$domain/$languageCode/canvas/a/list?title_no=${titleNo}",
 					rating = jo.getFloatOrDefault("starScoreAverage", -10f) / 10f,
@@ -157,7 +157,7 @@ internal abstract class LineWebtoonsParser(
 						Manga(
 							id = generateUid(titleNo),
 							title = jo.getString("title"),
-							altTitle = null,
+							altTitles = emptySet(),
 							url = titleNo.toString(),
 							publicUrl = "https://$domain/$languageCode/canvas/a/list?title_no=$titleNo",
 							rating = RATING_UNKNOWN,
@@ -203,7 +203,7 @@ internal abstract class LineWebtoonsParser(
 						Manga(
 							id = generateUid(titleNo),
 							title = jo.getString("title"),
-							altTitle = null,
+							altTitles = emptySet(),
 							url = titleNo.toString(),
 							publicUrl = "https://$domain/$languageCode/canvas/a/list?title_no=$titleNo",
 							rating = jo.getFloatOrDefault("starScoreAverage", -10f) / 10f,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/MangaDexParser.kt

@@ -7,10 +7,10 @@ import kotlinx.coroutines.coroutineScope
 import okhttp3.HttpUrl
 import org.json.JSONArray
 import org.json.JSONObject
-import org.koitharu.kotatsu.parsers.core.AbstractMangaParser
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.AbstractMangaParser
 import org.koitharu.kotatsu.parsers.exception.ParseException
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.model.search.MangaSearchQuery
@@ -353,7 +353,7 @@ internal class MangaDexParser(context: MangaLoaderContext) : AbstractMangaParser
 			title = requireNotNull(attrs.getJSONObject("title").selectByLocale()) {
 				"Title should not be null"
 			},
-			altTitle = attrs.optJSONArray("altTitles")?.flatten()?.selectByLocale(),
+			altTitles = setOfNotNull(attrs.optJSONArray("altTitles")?.flatten()?.selectByLocale()), // TODO
 			url = id,
 			publicUrl = "https://$domain/title/$id",
 			rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/MangaFireParser.kt

@@ -11,9 +11,9 @@ import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.bitmap.Rect
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.suspendlazy.suspendLazy
@@ -163,7 +163,7 @@ internal abstract class MangaFireParser(
 				title = a.ownText(),
 				coverUrl = it.selectFirstOrThrow("img").attrAsAbsoluteUrl("src"),
 				source = source,
-				altTitle = null,
+				altTitles = emptySet(),
 				largeCoverUrl = null,
 				authors = emptySet(),
 				contentRating = null,
@@ -184,7 +184,7 @@ internal abstract class MangaFireParser(
 
 		return manga.copy(
 			title = document.selectFirstOrThrow(".info > h1").ownText(),
-			altTitle = document.selectFirst(".info > h6")?.ownTextOrNull(),
+			altTitles = setOfNotNull(document.selectFirst(".info > h6")?.ownTextOrNull()),
 			rating = document.selectFirst("div.rating-box")?.attr("data-score")
 				?.toFloatOrNull()?.div(10) ?: RATING_UNKNOWN,
 			coverUrl = document.selectFirstOrThrow("div.manga-detail div.poster img")
@@ -331,7 +331,7 @@ internal abstract class MangaFireParser(
 					coverUrl = mangaDocument.selectFirstOrThrow("div.manga-detail div.poster img")
 						.attrAsAbsoluteUrl("src"),
 					source = source,
-					altTitle = null,
+					altTitles = emptySet(),
 					largeCoverUrl = null,
 					authors = emptySet(),
 					contentRating = null,
@@ -354,7 +354,7 @@ internal abstract class MangaFireParser(
 					title = it.selectFirstOrThrow(".info h6").ownText(),
 					coverUrl = it.selectFirstOrThrow(".poster img").attrAsAbsoluteUrl("src"),
 					source = source,
-					altTitle = null,
+					altTitles = emptySet(),
 					largeCoverUrl = null,
 					authors = emptySet(),
 					contentRating = null,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/MangaPark.kt

@@ -4,8 +4,8 @@ import androidx.collection.ArrayMap
 import kotlinx.coroutines.coroutineScope
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.suspendlazy.suspendLazy
@@ -157,7 +157,7 @@ internal class MangaPark(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = div.selectFirst("h3")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.text-yellow-500")?.text()?.toFloatOrNull()?.div(10F) ?: RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -195,7 +195,7 @@ internal class MangaPark(context: MangaLoaderContext) :
 		val dateFormat = SimpleDateFormat("dd/MM/yyyy", sourceLocale)
 		val author = doc.selectFirst("div[q:key=tz_4]")?.textOrNull()
 		manga.copy(
-			altTitle = doc.selectFirst("div[q:key=tz_2]")?.textOrNull(),
+			altTitles = setOfNotNull(doc.selectFirst("div[q:key=tz_2]")?.textOrNull()),
 			authors = author?.let { setOf(it) } ?: emptySet(),
 			description = doc.selectFirst("react-island[q:key=0a_9]")?.html(),
 			state = when (doc.selectFirst("span[q:key=Yn_5]")?.text()?.lowercase()) {

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/MangaPlusParser.kt

@@ -10,8 +10,8 @@ import org.json.JSONArray
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.asTypedList
@@ -121,7 +121,7 @@ internal abstract class MangaPlusParser(
 				publicUrl = "/titles/$titleId".toAbsoluteUrl(domain),
 				title = name,
 				coverUrl = it.getString("portraitImageUrl"),
-				altTitle = null,
+				altTitles = emptySet(),
 				authors = setOf(author),
 				contentRating = null,
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/MangaReaderToParser.kt

@@ -9,10 +9,10 @@ import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.bitmap.Bitmap
 import org.koitharu.kotatsu.parsers.bitmap.Rect
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.suspendlazy.suspendLazy
@@ -131,7 +131,7 @@ internal class MangaReaderToParser(context: MangaLoaderContext) :
 				title = thumb.attr("alt"),
 				coverUrl = thumb.attr("src"),
 				source = source,
-				altTitle = null,
+				altTitles = emptySet(),
 				authors = emptySet(),
 				contentRating = null,
 				rating = RATING_UNKNOWN,
@@ -154,7 +154,7 @@ internal class MangaReaderToParser(context: MangaLoaderContext) :
 					title = thumb.attr("alt"),
 					coverUrl = thumb.attrAsAbsoluteUrlOrNull("src"),
 					source = source,
-					altTitle = null,
+					altTitles = emptySet(),
 					authors = emptySet(),
 					contentRating = null,
 					rating = RATING_UNKNOWN,
@@ -174,7 +174,7 @@ internal class MangaReaderToParser(context: MangaLoaderContext) :
 
 		return manga.copy(
 			title = document.selectFirst("h2.manga-name")!!.ownText(),
-			altTitle = document.selectFirst("div.manga-name-or")?.ownTextOrNull(),
+			altTitles = setOfNotNull(document.selectFirst("div.manga-name-or")?.ownTextOrNull()),
 			rating = document.selectFirst("div.anisc-info .item:contains(score:) > .name")
 				?.text()?.toFloatOrNull()?.div(10) ?: RATING_UNKNOWN,
 			coverUrl = document.selectFirst(".manga-poster > img")?.attrAsAbsoluteUrlOrNull("src"),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/NineMangaParser.kt

@@ -8,8 +8,8 @@ import okhttp3.Interceptor
 import okhttp3.Response
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.SimpleDateFormat
@@ -113,7 +113,7 @@ internal abstract class NineMangaParser(
 				url = relUrl,
 				publicUrl = href,
 				title = dd?.selectFirst("a.bookname")?.text()?.toCamelCase().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				coverUrl = node.selectFirst("img")?.src(),
 				rating = RATING_UNKNOWN,
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/NineNineNineHentaiParser.kt

@@ -8,8 +8,8 @@ import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.Broken
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.asTypedList
@@ -200,7 +200,7 @@ internal class NineNineNineHentaiParser(context: MangaLoaderContext) :
 		Manga(
 			id = generateUid(id),
 			title = name.replace(shortenTitleRegex, "").trim(),
-			altTitle = name,
+			altTitles = setOf(name),
 			coverUrl = when {
 				cover?.startsWith("http") == true -> cover
 				cover == null -> null
@@ -267,7 +267,7 @@ internal class NineNineNineHentaiParser(context: MangaLoaderContext) :
 		val author = tags?.filter { it.type == "artist" }?.joinToString { it.name.toCamelCase() }?.nullIfEmpty()
 		return manga.copy(
 			title = name.replace(shortenTitleRegex, "").trim(),
-			altTitle = name,
+			altTitles = setOf(name),
 			coverUrl = cover.first,
 			largeCoverUrl = cover.second,
 			authors = author?.let { setOf(it) } ?: emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/WebtoonsParser.kt

@@ -8,9 +8,9 @@ import okhttp3.HttpUrl.Companion.toHttpUrl
 import org.json.JSONArray
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.exception.NotFoundException
 import org.koitharu.kotatsu.parsers.exception.ParseException
 import org.koitharu.kotatsu.parsers.model.*
@@ -129,7 +129,7 @@ internal abstract class WebtoonsParser(
 					Manga(
 						id = generateUid(titleNo),
 						title = jo.getString("title"),
-						altTitle = null,
+						altTitles = emptySet(),
 						url = "$titleNo",
 						publicUrl = "https://$domain/$languageCode/originals/a/list?title_no=${titleNo}",
 						rating = jo.getFloatOrDefault("starScoreAverage", -10f) / 10f,
@@ -169,7 +169,7 @@ internal abstract class WebtoonsParser(
 						publicUrl = "https://$domain/$languageCode/originals/a/list?title_no=$titleNo",
 						title = jo.getString("title"),
 						coverUrl = jo.getString("thumbnail").toAbsoluteUrl(staticDomain),
-						altTitle = null,
+						altTitles = emptySet(),
 						authors = author?.let { setOf(it) } ?: emptySet(),
 						contentRating = if (isNsfwSource) ContentRating.ADULT else null,
 						rating = jo.getFloatOrDefault("starScoreAverage", -10f) / 10f,
@@ -205,7 +205,7 @@ internal abstract class WebtoonsParser(
 							Manga(
 								id = generateUid(titleNo),
 								title = jo.getString("title"),
-								altTitle = null,
+								altTitles = emptySet(),
 								url = titleNo.toString(),
 								publicUrl = "https://$domain/$languageCode/originals/a/list?title_no=$titleNo",
 								rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/animebootstrap/AnimeBootstrapParser.kt

@@ -5,8 +5,8 @@ import kotlinx.coroutines.coroutineScope
 import org.json.JSONArray
 import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -107,7 +107,7 @@ internal abstract class AnimeBootstrapParser(
 				coverUrl = div.selectFirstOrThrow("div.product__item__pic")
 					.attrAsAbsoluteUrlOrNull("data-setbg"),
 				title = div.selectFirstOrThrow("div.product__item__text").text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/animebootstrap/fr/PapScan.kt

@@ -69,7 +69,7 @@ internal class PapScan(context: MangaLoaderContext) :
 				coverUrl = div.selectFirstOrThrow("div.product__item__pic")
 					.attrAsAbsoluteUrlOrNull("data-setbg"),
 				title = div.selectFirstOrThrow("div.product__item__text h5").text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/ar/FlixScans.kt

@@ -7,8 +7,8 @@ import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.Broken
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.mapJSON
@@ -109,7 +109,7 @@ internal class FlixScans(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = j.getString("title"),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/ar/MangaStorm.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.parsers.site.ar
 import org.koitharu.kotatsu.parsers.Broken
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import org.koitharu.kotatsu.parsers.util.*
@@ -71,7 +71,7 @@ internal class MangaStorm(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.select(".manga-ct-title").text(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/ar/TeamXNovel.kt

@@ -6,8 +6,8 @@ import kotlinx.coroutines.coroutineScope
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.SimpleDateFormat
@@ -105,7 +105,7 @@ internal class TeamXNovel(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.select(".tt, h3").text(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/be/AnibelParser.kt

@@ -4,10 +4,10 @@ import androidx.collection.ArraySet
 import org.json.JSONArray
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.Broken
-import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.generateUid
 import org.koitharu.kotatsu.parsers.util.getDomain
@@ -92,7 +92,7 @@ internal class AnibelParser(context: MangaLoaderContext) : LegacyMangaParser(con
 				title = title.getString("be"),
 				coverUrl = jo.getString("poster").removePrefix("/cdn")
 					.toAbsoluteUrl(getDomain("cdn")) + "?width=200&height=280",
-				altTitle = title.optJSONArray("alt")?.optString(0)?.nullIfEmpty(),
+				altTitles = setOfNotNull(title.optJSONArray("alt")?.optString(0)?.nullIfEmpty()),
 				authors = emptySet(),
 				contentRating = null,
 				rating = jo.getDouble("rating").toFloat() / 10f,
@@ -144,7 +144,7 @@ internal class AnibelParser(context: MangaLoaderContext) : LegacyMangaParser(con
 		).getJSONObject("chapters").getJSONArray("docs")
 		return manga.copy(
 			title = title.getString("be"),
-			altTitle = title.optJSONArray("alt")?.optString(0)?.nullIfEmpty(),
+			altTitles = setOfNotNull(title.optJSONArray("alt")?.optString(0)?.nullIfEmpty()),
 			coverUrl = "$poster?width=200&height=280",
 			largeCoverUrl = poster,
 			description = details.getJSONObject("description").getString("be"),
@@ -239,7 +239,7 @@ internal class AnibelParser(context: MangaLoaderContext) : LegacyMangaParser(con
 				title = title.getString("be"),
 				coverUrl = jo.getString("poster").removePrefix("/cdn")
 					.toAbsoluteUrl(getDomain("cdn")) + "?width=200&height=280",
-				altTitle = title.getString("en").nullIfEmpty(),
+				altTitles = setOfNotNull(title.getString("en").nullIfEmpty()),
 				authors = emptySet(),
 				contentRating = null,
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/cupfox/CupFoxParser.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.cupfox
 
 import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -95,7 +95,7 @@ internal abstract class CupFoxParser(
 			Manga(
 				id = generateUid(href),
 				title = li.selectFirst("h3, h4, p.dm-bn")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,
@@ -124,7 +124,9 @@ internal abstract class CupFoxParser(
 		val doc = webClient.httpGet(manga.url.toAbsoluteUrl(domain)).parseHtml()
 		val author = doc.selectFirst(selectMangaDetailsAuthor)?.text()?.substringAfter("：")?.nullIfEmpty()
 		return manga.copy(
-			altTitle = doc.selectFirst(selectMangaDetailsAltTitle)?.text()?.substringAfter("：")?.nullIfEmpty(),
+			altTitles = setOfNotNull(
+				doc.selectFirst(selectMangaDetailsAltTitle)?.text()?.substringAfter("：")?.nullIfEmpty(),
+			),
 			tags = doc.select(selectMangaDetailsTags).mapToSet { a ->
 				MangaTag(
 					key = a.attr("href").removeSuffix('/').substringAfterLast('/'),
@@ -161,7 +163,7 @@ internal abstract class CupFoxParser(
 				Manga(
 					id = generateUid(href),
 					title = li.selectFirst("h3, h4, p.dm-bn")?.text().orEmpty(),
-					altTitle = null,
+					altTitles = emptySet(),
 					url = href,
 					publicUrl = href.toAbsoluteUrl(domain),
 					rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/AsuraScansParser.kt

@@ -6,8 +6,8 @@ import kotlinx.coroutines.sync.withLock
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.asTypedList
@@ -113,7 +113,7 @@ internal class AsuraScansParser(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(domain),
 				coverUrl = a.selectFirst("img")?.src(),
 				title = a.selectFirst("div.block > span.block")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = a.selectFirst("div.block  label.ml-1")?.text()?.toFloatOrNull()?.div(10f) ?: RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/BeeToon.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.en
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.SimpleDateFormat
@@ -75,7 +75,7 @@ internal class BeeToon(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = div.selectFirst(".name")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst(".counter")?.text()?.toFloatOrNull()?.div(5f) ?: RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/CloneMangaParser.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.en
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -38,7 +38,7 @@ internal class CloneMangaParser(context: MangaLoaderContext) :
 				id = generateUid(href),
 				title = item.selectFirst("h3")?.text() ?: return@mapNotNull null,
 				coverUrl = "https://$domain/$cover",
-				altTitle = null,
+				altTitles = emptySet(),
 				authors = setOf("Dan Kim"),
 				rating = RATING_UNKNOWN,
 				url = href,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/ComicExtra.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.en
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import org.koitharu.kotatsu.parsers.util.*
@@ -71,7 +71,7 @@ internal class ComicExtra(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.selectFirstOrThrow("a.egb-serie").text(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,
@@ -106,7 +106,7 @@ internal class ComicExtra(context: MangaLoaderContext) :
 		val doc = webClient.httpGet(manga.url.toAbsoluteUrl(domain)).parseHtml()
 		val author = doc.selectFirst("table.full-table tr:contains(Author:) td:nth-child(2)")?.textOrNull()
 		return manga.copy(
-			altTitle = doc.selectFirstOrThrow("div.anime-top h1.title").textOrNull(),
+			altTitles = setOfNotNull(doc.selectFirstOrThrow("div.anime-top h1.title").textOrNull()),
 			state = when (doc.selectFirstOrThrow("ul.anime-genres li.status a").text()) {
 				"Ongoing" -> MangaState.ONGOING
 				"Completed" -> MangaState.FINISHED

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/DynastyScans.kt

@@ -9,8 +9,8 @@ import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import org.koitharu.kotatsu.parsers.util.*
@@ -86,7 +86,7 @@ internal class DynastyScans(context: MangaLoaderContext) :
 				Manga(
 					id = generateUid(href),
 					title = div.selectFirstOrThrow("div.caption").text(),
-					altTitle = null,
+					altTitles = emptySet(),
 					url = href,
 					publicUrl = href.toAbsoluteUrl(domain),
 					rating = RATING_UNKNOWN,
@@ -107,7 +107,7 @@ internal class DynastyScans(context: MangaLoaderContext) :
 				Manga(
 					id = generateUid(href),
 					title = div.selectFirstOrThrow("a").text(),
-					altTitle = null,
+					altTitles = emptySet(),
 					url = href,
 					publicUrl = href.toAbsoluteUrl(domain),
 					rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/FlameComics.kt

@@ -6,8 +6,8 @@ import org.json.JSONArray
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.*
@@ -132,9 +132,9 @@ internal class FlameComics(context: MangaLoaderContext) :
 		return Manga(
 			id = generateUid(seriesId),
 			title = jo.getString("title"),
-			altTitle = jo.getStringOrNull("altTitles")?.let {
-				JSONArray(it).optString(0)
-			},
+			altTitles = jo.getStringOrNull("altTitles")?.let {
+				JSONArray(it).toStringSet()
+			}.orEmpty(),
 			url = seriesId.toString(),
 			publicUrl = "https://${domain}/series/$seriesId",
 			rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/FlixScansOrg.kt

@@ -4,7 +4,10 @@ import kotlinx.coroutines.async
 import kotlinx.coroutines.coroutineScope
 import org.json.JSONArray
 import org.json.JSONObject
-import org.koitharu.kotatsu.parsers.*
+import org.koitharu.kotatsu.parsers.Broken
+import org.koitharu.kotatsu.parsers.ErrorMessages
+import org.koitharu.kotatsu.parsers.MangaLoaderContext
+import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
 import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
@@ -88,7 +91,7 @@ internal class FlixScansOrg(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = j.getString("title"),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/MangaGeko.kt

@@ -4,8 +4,8 @@ import kotlinx.coroutines.async
 import kotlinx.coroutines.coroutineScope
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.SimpleDateFormat
@@ -82,7 +82,7 @@ internal class MangaGeko(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.selectFirstOrThrow("h4").text(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,
@@ -112,7 +112,7 @@ internal class MangaGeko(context: MangaLoaderContext) :
 		val chaptersDeferred = async { loadChapters(manga.url) }
 		val author = doc.selectFirstOrThrow(".author").textOrNull()
 		manga.copy(
-			altTitle = doc.selectFirstOrThrow(".alternative-title").textOrNull(),
+			altTitles = setOfNotNull(doc.selectFirstOrThrow(".alternative-title").textOrNull()),
 			state = when (doc.selectFirstOrThrow(".header-stats span:contains(Status) strong").text()) {
 				"Ongoing" -> MangaState.ONGOING
 				"Completed" -> MangaState.FINISHED

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/MangaKawaiiEn.kt

@@ -5,8 +5,8 @@ import kotlinx.coroutines.coroutineScope
 import okhttp3.Headers
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -83,7 +83,7 @@ internal class MangaKawaiiEn(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src() ?: a.attrAsAbsoluteUrlOrNull("data-bg"),
 				title = div.selectFirstOrThrow("h4, .media-thumbnail__name").text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -102,7 +102,9 @@ internal class MangaKawaiiEn(context: MangaLoaderContext) :
 		val author = doc.select("a[href*=author]").textOrNull()
 		manga.copy(
 			description = doc.selectFirst("dd.text-justify.text-break")?.html(),
-			altTitle = doc.select("span[itemprop*=alternativeHeadline]").joinToString { ", " }.nullIfEmpty(),
+			altTitles = doc.select("span[itemprop*=alternativeHeadline]").mapNotNullToSet {
+				it.textOrNull()
+			},
 			authors = author?.let { setOf(it) } ?: emptySet(),
 			state = when (doc.selectFirst("span.badge.bg-success.text-uppercase")?.text()) {
 				"Ongoing" -> MangaState.ONGOING

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/MangaTownParser.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.en
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.DateFormat
@@ -118,7 +118,7 @@ internal class MangaTownParser(context: MangaLoaderContext) :
 				title = a.attr("title"),
 				coverUrl = a.selectFirst("img")?.attrAsAbsoluteUrlOrNull("src"),
 				source = MangaParserSource.MANGATOWN,
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = li.selectFirst("p.score")?.selectFirst("b")
 					?.ownText()?.toFloatOrNull()?.div(5f) ?: RATING_UNKNOWN,
 				authors = author?.let { setOf(it) } ?: emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/Mangaowl.kt

@@ -5,8 +5,8 @@ import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.Broken
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import org.koitharu.kotatsu.parsers.util.*
@@ -106,7 +106,7 @@ internal class Mangaowl(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = div.selectFirst("a.one-line")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.select("span").last()?.text()?.toFloatOrNull()?.div(5f) ?: RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/Manhwa18Com.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.parsers.site.en
 import androidx.collection.ArrayMap
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.suspendlazy.suspendLazy
@@ -125,7 +125,7 @@ internal class Manhwa18Com(context: MangaLoaderContext) :
 				Manga(
 					id = generateUid(absUrl.toRelativeUrl(domain)),
 					title = titleElement.text(),
-					altTitle = null,
+					altTitles = emptySet(),
 					url = absUrl.toRelativeUrl(domain),
 					publicUrl = absUrl,
 					rating = RATING_UNKNOWN,
@@ -164,8 +164,10 @@ internal class Manhwa18Com(context: MangaLoaderContext) :
 			}
 
 		return manga.copy(
-			altTitle = cardInfoElement?.selectFirst("b:contains(Other names)")?.parent()?.ownTextOrNull()
-				?.removePrefix(": "),
+			altTitles = setOfNotNull(
+				cardInfoElement?.selectFirst("b:contains(Other names)")?.parent()?.ownTextOrNull()
+					?.removePrefix(": "),
+			),
 			authors = author?.let { setOf(it) } ?: emptySet(),
 			description = docs.selectFirst(".series-summary .summary-content")?.html(),
 			tags = tags.orEmpty(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/Manhwa18Parser.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.parsers.site.en
 import androidx.collection.ArrayMap
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.suspendlazy.suspendLazy
@@ -125,7 +125,7 @@ internal class Manhwa18Parser(context: MangaLoaderContext) :
 				Manga(
 					id = generateUid(absUrl.toRelativeUrl(domain)),
 					title = titleElement.text(),
-					altTitle = null,
+					altTitles = emptySet(),
 					url = absUrl.toRelativeUrl(domain),
 					publicUrl = absUrl,
 					rating = RATING_UNKNOWN,
@@ -164,8 +164,10 @@ internal class Manhwa18Parser(context: MangaLoaderContext) :
 			}
 
 		return manga.copy(
-			altTitle = cardInfoElement?.selectFirst("b:contains(Other names)")?.parent()?.ownTextOrNull()
-				?.removePrefix(": "),
+			altTitles = setOfNotNull(
+				cardInfoElement?.selectFirst("b:contains(Other names)")?.parent()?.ownTextOrNull()
+					?.removePrefix(": "),
+			),
 			authors = author?.let { setOf(it) } ?: emptySet(),
 			description = docs.selectFirst(".series-summary .summary-content")?.html(),
 			tags = tags.orEmpty(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/ManhwasMen.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.en
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.DateFormat
@@ -85,7 +85,7 @@ internal class ManhwasMen(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(domain),
 				coverUrl = li.selectFirst("img")?.src(),
 				title = li.selectFirst(".title")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/MyComicList.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.en
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -74,7 +74,7 @@ internal class MyComicList(context: MangaLoaderContext) :
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				title = div.selectFirst("h3 a")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				authors = emptySet(),
 				tags = emptySet(),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/Po2Scans.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.parsers.site.en
 import org.koitharu.kotatsu.parsers.Broken
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.SimpleDateFormat
@@ -46,7 +46,7 @@ internal class Po2Scans(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.selectFirstOrThrow("h2").text(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/Pururin.kt

@@ -8,8 +8,8 @@ import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.Broken
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -96,7 +96,7 @@ internal class Pururin(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(domain),
 				coverUrl = a.selectFirst("img.card-img-top")?.src(),
 				title = a.selectFirst(".title")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -173,7 +173,7 @@ internal class Pururin(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(domain),
 				coverUrl = a.selectFirst("img.card-img-top")?.src(),
 				title = a.selectFirst(".title")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/VyManga.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.en
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.DateFormat
@@ -107,7 +107,7 @@ internal class VyManga(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(domain),
 				coverUrl = div.selectFirst(".comic-image img")?.src(),
 				title = div.selectFirst(".comic-title")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/en/WeebCentral.kt

@@ -7,7 +7,6 @@ import okhttp3.HttpUrl.Companion.toHttpUrl
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.MangaParser
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
 import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
@@ -186,7 +185,7 @@ internal class WeebCentral(context: MangaLoaderContext) : LegacyMangaParser(cont
 				url = mangaId,
 				publicUrl = "https://$domain/series/$mangaId",
 				title = element.selectFirstOrThrow("abbr[title] > a").text(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				contentRating = if (element.selectFirst("svg:has(style:containsData(ff0000))") == null) {
 					SAFE
@@ -233,8 +232,8 @@ internal class WeebCentral(context: MangaLoaderContext) : LegacyMangaParser(cont
 
 		manga.copy(
 			title = sectionRight.selectFirstOrThrow("h1").text(),
-			altTitle = sectionRight.select("li:has(strong:contains(Associated Name)) li")
-				.eachText().joinToString(),
+			altTitles = sectionRight.select("li:has(strong:contains(Associated Name)) li")
+				.eachText().toSet(),
 			publicUrl = "https://$domain/series/${manga.url}",
 			rating = RATING_UNKNOWN,
 			contentRating = if (sectionLeft.selectFirst("ul > li > strong:contains(Official Translation) + a:contains(Yes)") != null) {

src/main/kotlin/org/koitharu/kotatsu/parsers/site/es/TempleScanEsp.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.parsers.site.es
 import kotlinx.coroutines.coroutineScope
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import org.koitharu.kotatsu.parsers.util.*
@@ -44,7 +44,7 @@ internal class TempleScanEsp(context: MangaLoaderContext) :
 				publicUrl = href,
 				coverUrl = it.getString("urlImg"),
 				title = it.getString("name").orEmpty(),
-				altTitle = it.getStringOrNull("alternativeName"),
+				altTitles = setOfNotNull(it.getStringOrNull("alternativeName")),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/es/TuMangaOnlineParser.kt

@@ -6,8 +6,8 @@ import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.SimpleDateFormat
@@ -158,7 +158,7 @@ internal class TuMangaOnlineParser(context: MangaLoaderContext) : LegacyPagedMan
 				id = generateUid(href),
 				title = item.selectFirst("h4.text-truncate")?.text() ?: return@mapNotNull null,
 				coverUrl = item.select("style").toString().substringAfter("('").substringBeforeLast("')"),
-				altTitle = null,
+				altTitles = emptySet(),
 				authors = emptySet(),
 				rating = item.selectFirst("span.score")?.text()?.toFloatOrNull()?.div(10F) ?: RATING_UNKNOWN,
 				url = href,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fmreader/FmreaderParser.kt

@@ -4,8 +4,8 @@ import kotlinx.coroutines.async
 import kotlinx.coroutines.coroutineScope
 import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.DateFormat
@@ -144,7 +144,7 @@ internal abstract class FmreaderParser(
 					?: div.selectFirst("div.img-in-ratio")?.attr("style")?.substringAfter("(")
 						?.substringBefore(")"))?.toAbsoluteUrl(domain),
 				title = div.selectFirst("div.series-title")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -200,8 +200,8 @@ internal abstract class FmreaderParser(
 				)
 			},
 			description = desc,
-			altTitle = alt,
-			authors = author?.let { setOf(it) } ?: emptySet(),
+			altTitles = setOfNotNull(alt),
+			authors = setOfNotNull(author),
 			state = state,
 			chapters = chaptersDeferred.await(),
 		)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fmreader/ja/Klz9.kt

@@ -32,7 +32,7 @@ internal class Klz9(context: MangaLoaderContext) :
 				coverUrl = div.selectFirstOrThrow("div.img-in-ratio").attr("style").substringAfter("('")
 					.substringBeforeLast("')"),
 				title = div.selectFirstOrThrow("div.series-title").text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/foolslide/FoolSlideParser.kt

@@ -4,8 +4,8 @@ import kotlinx.coroutines.coroutineScope
 import org.json.JSONArray
 import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.SimpleDateFormat
@@ -90,7 +90,7 @@ internal abstract class FoolSlideParser(
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),// in search no img
 				title = div.selectFirst(".title a")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/BentomangaParser.kt

@@ -8,8 +8,8 @@ import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.Broken
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.exception.ParseException
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
@@ -115,7 +115,7 @@ internal class BentomangaParser(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.selectFirst("h1")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = div.getElementsByAttributeValue("data-icon", "avg_rate")
@@ -150,7 +150,7 @@ internal class BentomangaParser(context: MangaLoaderContext) :
 			.requireElementById("container_manga_show")
 		val author = root.selectFirst(".datas_more-authors-people")?.textOrNull()
 		return manga.copy(
-			altTitle = root.selectFirst(".component-manga-title_alt")?.textOrNull(),
+			altTitles = setOfNotNull(root.selectFirst(".component-manga-title_alt")?.textOrNull()),
 			description = root.selectFirst(".datas_synopsis")?.html().assertNotNull("description")
 				?: manga.description,
 			state = when (root.selectFirst(".datas_more-status-data")?.textOrNull().assertNotNull("status")) {

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/FuryoSociety.kt

@@ -5,8 +5,8 @@ import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.ErrorMessages
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import org.koitharu.kotatsu.parsers.util.*
@@ -71,7 +71,7 @@ internal class FuryoSociety(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (div.selectFirst("div.media-body") ?: div.selectFirst("a"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/LegacyScansParser.kt

@@ -4,8 +4,8 @@ import org.json.JSONArray
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.mapJSON
@@ -132,7 +132,7 @@ internal class LegacyScansParser(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(urlManga),
 				title = j.getString("title"),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = urlManga,
 				publicUrl = urlManga,
 				rating = RATING_UNKNOWN,
@@ -153,7 +153,7 @@ internal class LegacyScansParser(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(urlManga),
 				title = j.getString("title"),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = urlManga,
 				publicUrl = urlManga,
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/LireScan.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.parsers.site.fr
 import org.koitharu.kotatsu.parsers.Broken
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.SimpleDateFormat
@@ -68,7 +68,7 @@ internal class LireScan(context: MangaLoaderContext) : LegacyPagedMangaParser(co
 			Manga(
 				id = generateUid(href),
 				title = div.select(".item-poster__title").text(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = div.selectFirstOrThrow(".item__rating").ownText().toFloatOrNull()?.div(10f) ?: RATING_UNKNOWN,
@@ -89,8 +89,10 @@ internal class LireScan(context: MangaLoaderContext) : LegacyPagedMangaParser(co
 			.replace("Artist(s):", "")
 			.nullIfEmpty()
 		return manga.copy(
-			altTitle = root.select("ul.pmovie__list li:contains(Nom Alternatif:)").text()
-				.replace("Nom Alternatif:", "").nullIfEmpty(),
+			altTitles = setOfNotNull(
+				root.select("ul.pmovie__list li:contains(Nom Alternatif:)").text()
+					.replace("Nom Alternatif:", "").nullIfEmpty(),
+			),
 			state = when (root.select("ul.pmovie__list li:contains(Status:)").text()) {
 				"Status: OnGoing", "Status: En cours" -> MangaState.ONGOING
 				"Status: Fini" -> MangaState.FINISHED

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/LugnicaScans.kt

@@ -4,8 +4,8 @@ import org.json.JSONArray
 import org.koitharu.kotatsu.parsers.ErrorMessages
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import org.koitharu.kotatsu.parsers.util.*
@@ -107,7 +107,7 @@ internal class LugnicaScans(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(urlManga),
 				title = j.getString("manga_title"),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = urlManga.toRelativeUrl(domain),
 				publicUrl = urlManga.toAbsoluteUrl(domain),
 				rating = j.getFloatOrDefault("manga_rate", RATING_UNKNOWN).div(5f),
@@ -128,7 +128,7 @@ internal class LugnicaScans(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(urlManga),
 				title = j.getString("title"),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = urlManga.toRelativeUrl(domain),
 				publicUrl = urlManga.toAbsoluteUrl(domain),
 				rating = j.getString("rate").toFloatOrNull()?.div(5f) ?: RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/MangaKawaii.kt

@@ -5,8 +5,8 @@ import kotlinx.coroutines.coroutineScope
 import okhttp3.Headers
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -83,7 +83,7 @@ internal class MangaKawaii(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src() ?: a.attrAsAbsoluteUrlOrNull("data-bg"),
 				title = div.selectFirst("h4, .media-thumbnail__name")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -99,11 +99,14 @@ internal class MangaKawaii(context: MangaLoaderContext) :
 		val doc = webClient.httpGet(manga.url.toAbsoluteUrl(domain)).parseHtml()
 		val firstChapter = doc.selectFirst("tr[class*='volume-'] a")?.attr("href")
 		val chaptersDeferred = async { loadChapters(firstChapter) }
-		val author = doc.select("a[href*=author]").text()
+		val author = doc.select("a[href*=author]").textOrNull()
 		manga.copy(
 			description = doc.selectFirst("dd.text-justify.text-break")?.html(),
-			altTitle = doc.select("span[itemprop*=alternativeHeadline]").joinToString { ", " }.nullIfEmpty(),
-			authors = author?.let { setOf(it) } ?: emptySet(),
+			altTitles = setOfNotNull(
+				doc.select("span[itemprop*=alternativeHeadline]").joinToString { ", " }
+					.nullIfEmpty(),
+			),
+			authors = setOfNotNull(author),
 			state = when (doc.selectFirst("span.badge.bg-success.text-uppercase")?.text()) {
 				"En Cours" -> MangaState.ONGOING
 				"Terminé" -> MangaState.FINISHED

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/MangaMana.kt

@@ -11,12 +11,13 @@ import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.exception.ParseException
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.getIntOrDefault
+import org.koitharu.kotatsu.parsers.util.json.getStringOrNull
 import org.koitharu.kotatsu.parsers.util.json.mapJSON
 import java.text.SimpleDateFormat
 import java.util.*
@@ -78,7 +79,7 @@ internal class MangaMana(context: MangaLoaderContext) :
 							id = generateUid(url),
 							title = jo.getString("name").orEmpty(),
 							coverUrl = img,
-							altTitle = jo.getString("otherNames").orEmpty(),
+							altTitles = setOfNotNull(jo.getStringOrNull("otherNames")),
 							authors = emptySet(),
 							contentRating = if (isNsfwSource) ContentRating.ADULT else null,
 							rating = RATING_UNKNOWN,
@@ -109,7 +110,8 @@ internal class MangaMana(context: MangaLoaderContext) :
 						val doc = webClient.httpGet("https://$domain/?page=$page").parseHtml()
 						return doc.select("div.row div.col_home").map { div ->
 							val href = div.selectFirstOrThrow("h4 a").attrAsRelativeUrl("href")
-							val isNsfwSource = div.selectFirst("img[data-adult]")?.attr("data-adult")?.isNotEmpty() == true
+							val isNsfwSource =
+								div.selectFirst("img[data-adult]")?.attr("data-adult")?.isNotEmpty() == true
 							val img = if (isNsfwSource) {
 								div.selectFirst("img")?.attr("data-adult")
 							} else {
@@ -118,7 +120,7 @@ internal class MangaMana(context: MangaLoaderContext) :
 							Manga(
 								id = generateUid(href),
 								title = div.select("h4").text(),
-								altTitle = null,
+								altTitles = emptySet(),
 								url = href,
 								publicUrl = href.toAbsoluteUrl(domain),
 								rating = RATING_UNKNOWN,
@@ -181,7 +183,7 @@ internal class MangaMana(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.select("h2.fs-6").text(),
-				altTitle = doc.selectFirst(".mangalist_item_othernames")?.text().orEmpty(),
+				altTitles = setOfNotNull(doc.selectFirst(".mangalist_item_othernames")?.textOrNull()),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = div.getElementById("avgrating")?.ownText()?.toFloatOrNull()?.div(5f) ?: RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/ScansMangasMe.kt

@@ -6,8 +6,8 @@ import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.Broken
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import org.koitharu.kotatsu.parsers.util.*
@@ -83,7 +83,7 @@ internal class ScansMangasMe(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = div.selectFirstOrThrow("div.bigor div.tt").text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirstOrThrow("div.rating i").ownText().toFloatOrNull()?.div(10f)
 					?: RATING_UNKNOWN,
 				tags = emptySet(),
@@ -124,8 +124,8 @@ internal class ScansMangasMe(context: MangaLoaderContext) :
 				)
 			},
 			description = desc,
-			altTitle = alt,
-			authors = author?.let { setOf(it) } ?: emptySet(),
+			altTitles = setOfNotNull(alt),
+			authors = setOfNotNull(author),
 			state = when (doc.selectFirstOrThrow("div.spe span:contains(Statut:)").textOrNull()
 				?.substringAfterLast(':')) {
 				" En cours" -> MangaState.ONGOING

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fr/ScantradUnion.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.fr
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.exception.ParseException
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
@@ -84,7 +84,7 @@ internal class ScantradUnion(context: MangaLoaderContext) :
 					Manga(
 						id = generateUid(href),
 						title = article.select(".carteinfos a").text(),
-						altTitle = null,
+						altTitles = emptySet(),
 						url = href,
 						publicUrl = href.toAbsoluteUrl(domain),
 						rating = RATING_UNKNOWN,
@@ -104,7 +104,7 @@ internal class ScantradUnion(context: MangaLoaderContext) :
 					Manga(
 						id = generateUid(href),
 						title = article.select(".index-post-header a").text(),
-						altTitle = null,
+						altTitles = emptySet(),
 						url = href,
 						publicUrl = href.toAbsoluteUrl(domain),
 						rating = RATING_UNKNOWN,
@@ -125,7 +125,7 @@ internal class ScantradUnion(context: MangaLoaderContext) :
 		val author = root.select("div.project-details a[href*=auteur]").textOrNull()
 
 		return manga.copy(
-			altTitle = root.select(".divider2:contains(Noms associés :)").firstOrNull()?.textOrNull(),
+			altTitles = setOfNotNull(root.select(".divider2:contains(Noms associés :)").firstOrNull()?.textOrNull()),
 			state = when (root.select(".label.label-primary")[2].text()) {
 				"En cours" -> MangaState.ONGOING
 				"Terminé", "Abondonné", "One Shot" -> MangaState.FINISHED

src/main/kotlin/org/koitharu/kotatsu/parsers/site/fuzzydoodle/FuzzyDoodleParser.kt

@@ -7,8 +7,8 @@ import kotlinx.coroutines.coroutineScope
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.DateFormat
@@ -149,7 +149,7 @@ internal abstract class FuzzyDoodleParser(
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = div.selectFirst("h2")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -184,7 +184,7 @@ internal abstract class FuzzyDoodleParser(
 		val author = doc.selectFirst(selectAuthor)?.textOrNull()
 
 		manga.copy(
-			altTitle = doc.selectLast(selectAltTitle)?.textOrNull(),
+			altTitles = setOfNotNull(doc.selectLast(selectAltTitle)?.textOrNull()),
 			state = when (doc.selectFirst(selectState)?.text()?.lowercase().orEmpty()) {
 				in ongoing -> MangaState.ONGOING
 				in finished -> MangaState.FINISHED

src/main/kotlin/org/koitharu/kotatsu/parsers/site/galleryadults/GalleryAdultsParser.kt

@@ -8,8 +8,8 @@ import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.ErrorMessages
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -109,7 +109,7 @@ internal abstract class GalleryAdultsParser(
 			Manga(
 				id = generateUid(href),
 				title = div.select(selectGalleryTitle).text().cleanupTitle(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/galleryadults/all/DoujinDesuUk.kt

@@ -39,7 +39,7 @@ internal class DoujinDesuUk(context: MangaLoaderContext) :
 				title = div.select(selectGalleryTitle).text().replace(regexBrackets, "")
 					.replace(regexSpaces, " ")
 					.trim(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/galleryadults/all/NHentaiParser.kt

@@ -90,7 +90,7 @@ internal class NHentaiParser(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.select(selectGalleryTitle).text().cleanupTitle(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/galleryadults/all/NHentaiToParser.kt

@@ -80,7 +80,7 @@ internal class NHentaiToParser(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.select(selectGalleryTitle).text().cleanupTitle(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/galleryadults/all/NHentaiXxxParser.kt

@@ -93,7 +93,7 @@ internal class NHentaiXxxParser(context: MangaLoaderContext) :
 			Manga(
 				id = generateUid(href),
 				title = div.select(selectGalleryTitle).text().cleanupTitle(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/gattsu/GattsuParser.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.parsers.site.gattsu
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -79,7 +79,7 @@ internal abstract class GattsuParser(
 				publicUrl = href,
 				title = li.selectLast(".thumb-titulo, .video-titulo")?.text().orEmpty(),
 				coverUrl = li.selectFirst("img")?.src(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				description = null,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/gattsu/pt/MundoHentaiOficial.kt

@@ -5,7 +5,10 @@ import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.site.gattsu.GattsuParser
-import org.koitharu.kotatsu.parsers.util.*
+import org.koitharu.kotatsu.parsers.util.attrAsAbsoluteUrl
+import org.koitharu.kotatsu.parsers.util.generateUid
+import org.koitharu.kotatsu.parsers.util.selectLastOrThrow
+import org.koitharu.kotatsu.parsers.util.src
 
 @MangaSourceParser("MUNDOHENTAIOFICIAL", "MundoHentaiOficial", "pt", ContentType.HENTAI)
 internal class MundoHentaiOficial(context: MangaLoaderContext) :
@@ -27,7 +30,7 @@ internal class MundoHentaiOficial(context: MangaLoaderContext) :
 				publicUrl = href,
 				title = li.selectLastOrThrow(".thumb-titulo, .video-titulo").text(),
 				coverUrl = li.selectFirst("img")?.src(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				description = null,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/guya/GuyaParser.kt

@@ -2,10 +2,13 @@ package org.koitharu.kotatsu.parsers.site.guya
 
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.model.*
-import org.koitharu.kotatsu.parsers.util.*
+import org.koitharu.kotatsu.parsers.util.generateUid
+import org.koitharu.kotatsu.parsers.util.parseJson
+import org.koitharu.kotatsu.parsers.util.removeSuffix
+import org.koitharu.kotatsu.parsers.util.toAbsoluteUrl
 import java.util.*
 
 internal abstract class GuyaParser(
@@ -67,7 +70,7 @@ internal abstract class GuyaParser(
 			publicUrl = url,
 			title = name,
 			coverUrl = j.getString("cover").toAbsoluteUrl(domain),
-			altTitle = null,
+			altTitles = emptySet(),
 			rating = RATING_UNKNOWN,
 			tags = emptySet(),
 			description = j.getString("description"),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/heancms/HeanCms.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.parsers.site.heancms
 import org.json.JSONArray
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.asTypedList
@@ -125,7 +125,7 @@ internal abstract class HeanCms(
 				id = id,
 				url = url,
 				title = title,
-				altTitle = it.getString("alternative_names").takeIf { it.isNotBlank() },
+				altTitles = setOfNotNull(it.getString("alternative_names").takeIf { it.isNotBlank() }),
 				publicUrl = publicUrl.toAbsoluteUrl(domain),
 				description = it.getString("description"),
 				rating = it.getFloatOrDefault("rating", RATING_UNKNOWN) / 5f,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/heancmsalt/HeanCmsAlt.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.heancmsalt
 
 import org.koitharu.kotatsu.parsers.ErrorMessages
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.DateFormat
@@ -67,7 +67,7 @@ internal abstract class HeanCmsAlt(
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = div.selectFirst(selectMangaTitle)?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -89,7 +89,7 @@ internal abstract class HeanCmsAlt(
 		val doc = webClient.httpGet(fullUrl).parseHtml()
 		val dateFormat = SimpleDateFormat(datePattern, sourceLocale)
 		return manga.copy(
-			altTitle = doc.selectFirst(selectAlt)?.textOrNull(),
+			altTitles = setOfNotNull(doc.selectFirst(selectAlt)?.textOrNull()),
 			description = doc.selectFirst(selectDesc)?.html(),
 			chapters = doc.select(selectChapter)
 				.mapChapters(reversed = true) { i, a ->

src/main/kotlin/org/koitharu/kotatsu/parsers/site/heancmsalt/es/Brakeout.kt

@@ -25,7 +25,7 @@ internal class Brakeout(context: MangaLoaderContext) :
 		val doc = webClient.httpGet(fullUrl).parseHtml()
 		val dateFormat = SimpleDateFormat(datePattern, sourceLocale)
 		return manga.copy(
-			altTitle = doc.selectFirst(selectAlt)?.textOrNull(),
+			altTitles = setOfNotNull(doc.selectFirst(selectAlt)?.textOrNull()),
 			description = doc.selectFirstOrThrow(selectDesc).html(),
 			chapters = doc.select(selectChapter)
 				.mapChapters(reversed = true) { i, div ->

src/main/kotlin/org/koitharu/kotatsu/parsers/site/hotcomics/HotComicsParser.kt

@@ -7,8 +7,8 @@ import kotlinx.coroutines.sync.withLock
 import okhttp3.Headers
 import org.jsoup.nodes.Document
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
 import org.koitharu.kotatsu.parsers.util.*
@@ -109,7 +109,7 @@ internal abstract class HotComicsParser(
 				publicUrl = url.toAbsoluteUrl(domain),
 				coverUrl = li.selectFirst("img")?.src(),
 				title = li.selectFirst(".title")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				description = li.selectFirst("p[itemprop*=description]")?.text().orEmpty(),
 				tags = tags,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/id/DoujinDesuParser.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.parsers.site.id
 import okhttp3.Headers
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.SimpleDateFormat
@@ -116,7 +116,7 @@ internal class DoujinDesuParser(context: MangaLoaderContext) :
 				Manga(
 					id = generateUid(href),
 					title = it.selectFirst(".metadata > a")?.attr("title").orEmpty(),
-					altTitle = null,
+					altTitles = emptySet(),
 					url = href,
 					publicUrl = href.toAbsoluteUrl(domain),
 					rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/id/HentaiCrot.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.id
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -68,7 +68,7 @@ internal class HentaiCrot(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src()?.replace("-200x285", ""),
 				title = div.selectFirst("h2")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -98,7 +98,9 @@ internal class HentaiCrot(context: MangaLoaderContext) :
 		val author = doc.selectFirst("div.entry-content ul li:contains(Artists :) em")?.textOrNull()
 		return manga.copy(
 			description = doc.selectFirst("div.entry-content p")?.html(),
-			altTitle = doc.selectFirst("div.entry-content ul li:contains(Alternative Name(s) :) em")?.textOrNull(),
+			altTitles = setOfNotNull(
+				doc.selectFirst("div.entry-content ul li:contains(Alternative Name(s) :) em")?.textOrNull(),
+			),
 			authors = author?.let { setOf(it) } ?: emptySet(),
 			state = null,
 			chapters = listOf(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/id/PixHentai.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.id
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaSourceParser
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.util.*
@@ -68,7 +68,7 @@ internal class PixHentai(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src()?.replace("-200x285", ""),
 				title = div.selectFirst("h2")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),
 				authors = emptySet(),
@@ -98,7 +98,9 @@ internal class PixHentai(context: MangaLoaderContext) :
 		val author = doc.selectFirst("div.entry-content ul li:contains(Artists :) em")?.textOrNull()
 		return manga.copy(
 			description = doc.selectFirst("div.entry-content p")?.html(),
-			altTitle = doc.selectFirst("div.entry-content ul li:contains(Alternative Name(s) :) em")?.textOrNull(),
+			altTitles = setOfNotNull(
+				doc.selectFirst("div.entry-content ul li:contains(Alternative Name(s) :) em")?.textOrNull(),
+			),
 			authors = author?.let { setOf(it) } ?: emptySet(),
 			state = null,
 			chapters = listOf(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/iken/IkenParser.kt

@@ -2,8 +2,8 @@ package org.koitharu.kotatsu.parsers.site.iken
 
 import org.json.JSONObject
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.asTypedList
@@ -109,7 +109,7 @@ internal abstract class IkenParser(
 				publicUrl = url.toAbsoluteUrl(domain),
 				coverUrl = it.getString("featuredImage"),
 				title = it.getString("postTitle"),
-				altTitle = it.getString("alternativeTitles"),
+				altTitles = setOfNotNull(it.getStringOrNull("alternativeTitles")),
 				description = it.getString("postContent"),
 				rating = RATING_UNKNOWN,
 				tags = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/ja/NicovideoSeigaParser.kt

@@ -1,10 +1,10 @@
 package org.koitharu.kotatsu.parsers.site.ja
 
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
 import org.koitharu.kotatsu.parsers.MangaSourceParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyMangaParser
 import org.koitharu.kotatsu.parsers.exception.AuthRequiredException
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.network.UserAgents
@@ -89,7 +89,7 @@ internal class NicovideoSeigaParser(context: MangaLoaderContext) :
 				id = generateUid(href),
 				title = item.selectFirst(".mg_body > .title > a")?.text() ?: return@mapNotNull null,
 				coverUrl = item.selectFirst(".comic_icon > div > a > img")?.attrAsAbsoluteUrl("src"),
-				altTitle = null,
+				altTitles = emptySet(),
 				authors = author?.let { setOf(it) } ?: emptySet(),
 				rating = RATING_UNKNOWN,
 				url = href,
@@ -193,7 +193,7 @@ internal class NicovideoSeigaParser(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(item.host ?: domain),
 				title = item.selectFirst(".search_result__item__info > .search_result__item__info--title > a")
 					?.textOrNull() ?: return@mapNotNull null,
-				altTitle = null,
+				altTitles = emptySet(),
 				authors = emptySet(),
 				tags = emptySet(),
 				rating = RATING_UNKNOWN,

src/main/kotlin/org/koitharu/kotatsu/parsers/site/keyoapp/KeyoappParser.kt

@@ -5,8 +5,8 @@ import kotlinx.coroutines.coroutineScope
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacySinglePageMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.DateFormat
@@ -129,7 +129,7 @@ internal abstract class KeyoappParser(
 			publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 			coverUrl = cover?.styleValueOrNull("background-image")?.cssUrl(),
 			title = div.selectFirstOrThrow("h3").text().orEmpty(),
-			altTitle = null,
+			altTitles = emptySet(),
 			rating = RATING_UNKNOWN,
 			tags = div.select("div.gap-1 a").mapToSet { a ->
 				MangaTag(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/likemanga/LikeMangaParser.kt

@@ -7,8 +7,8 @@ import okhttp3.HttpUrl.Companion.toHttpUrl
 import org.json.JSONObject
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import java.text.DateFormat
@@ -111,7 +111,7 @@ internal abstract class LikeMangaParser(
 			Manga(
 				id = generateUid(href),
 				title = div.selectFirstOrThrow("p.title-manga").text(),
-				altTitle = null,
+				altTitles = emptySet(),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(domain),
 				rating = RATING_UNKNOWN,
@@ -151,7 +151,7 @@ internal abstract class LikeMangaParser(
 		}
 		val author = doc.selectLast("li.author p")?.textOrNull()
 		return manga.copy(
-			altTitle = doc.selectFirst(".list-info li.othername h2")?.textOrNull(),
+			altTitles = setOfNotNull(doc.selectFirst(".list-info li.othername h2")?.textOrNull()),
 			tags = doc.select("li.kind a").mapToSet { a ->
 				MangaTag(
 					key = a.attr("href").removeSuffix('/').substringAfterLast('/'),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/liliana/LilianaParser.kt

@@ -5,8 +5,8 @@ import kotlinx.coroutines.coroutineScope
 import org.jsoup.Jsoup
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.model.*
 import org.koitharu.kotatsu.parsers.util.*
 import org.koitharu.kotatsu.parsers.util.json.getBooleanOrDefault
@@ -116,7 +116,7 @@ internal abstract class LilianaParser(
 			publicUrl = href.toAbsoluteUrl(domain),
 			coverUrl = element.selectFirst("img")?.src(),
 			title = element.selectFirst(".text-center a")?.text().orEmpty(),
-			altTitle = null,
+			altTitles = emptySet(),
 			rating = RATING_UNKNOWN,
 			tags = emptySet(),
 			authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/MadaraParser.kt

@@ -8,8 +8,8 @@ import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
-import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.config.ConfigKey
+import org.koitharu.kotatsu.parsers.core.LegacyPagedMangaParser
 import org.koitharu.kotatsu.parsers.exception.AuthRequiredException
 import org.koitharu.kotatsu.parsers.exception.ParseException
 import org.koitharu.kotatsu.parsers.model.*
@@ -468,7 +468,7 @@ internal abstract class MadaraParser(
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3, h4") ?: div.selectFirst(".manga-name, .post-title"))?.text()
 					.orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: RATING_UNKNOWN,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(
@@ -575,7 +575,7 @@ internal abstract class MadaraParser(
 				)
 			},
 			description = desc,
-			altTitle = alt,
+			altTitles = setOfNotNull(alt),
 			state = state,
 			chapters = chaptersDeferred.await(),
 			contentRating = if (doc.selectFirst(".adult-confirm") != null) {
@@ -659,7 +659,7 @@ internal abstract class MadaraParser(
 				id = generateUid(href),
 				url = href,
 				publicUrl = href.toAbsoluteUrl(a.host ?: domain),
-				altTitle = null,
+				altTitles = emptySet(),
 				title = div.selectFirstOrThrow(".widget-title").text(),
 				authors = emptySet(),
 				coverUrl = div.selectFirst("img")?.src(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/all/Manga18Fx.kt

@@ -71,7 +71,7 @@ internal class Manga18Fx(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = div.selectFirstOrThrow("h3").text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("div.item-rate span")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/all/Manhwa18Cc.kt

@@ -77,7 +77,7 @@ internal class Manhwa18Cc(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = div.selectFirstOrThrow("h3").text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst(".item-rate span")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/AdultWebtoon.kt

@@ -118,7 +118,7 @@ internal class AdultWebtoon(context: MangaLoaderContext) :
 				)
 			},
 			description = desc,
-			altTitle = alt,
+			altTitles = setOfNotNull(alt),
 			state = state,
 			chapters = chaptersDeferred.await(),
 		)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/FireScans.kt

@@ -25,7 +25,7 @@ internal class FireScans(context: MangaLoaderContext) :
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4")
 				?: div.selectFirst(".manga-name"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/Hentai4Free.kt

@@ -110,7 +110,7 @@ internal class Hentai4Free(context: MangaLoaderContext) :
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4")
 				?: div.selectFirst(".manga-name"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/HentaiManga.kt

@@ -112,7 +112,7 @@ internal class HentaiManga(context: MangaLoaderContext) :
 				)
 			},
 			description = desc,
-			altTitle = alt,
+			altTitles = setOfNotNull(alt),
 			state = state,
 			chapters = chaptersDeferred.await(),
 		)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/HentaiWebtoon.kt

@@ -112,7 +112,7 @@ internal class HentaiWebtoon(context: MangaLoaderContext) :
 				)
 			},
 			description = desc,
-			altTitle = alt,
+			altTitles = setOfNotNull(alt),
 			state = state,
 			chapters = chaptersDeferred.await(),
 		)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/IsekaiScan.kt

@@ -84,7 +84,7 @@ internal class IsekaiScan(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/IsekaiScanEuParser.kt

@@ -107,7 +107,7 @@ internal class IsekaiScanEuParser(context: MangaLoaderContext) :
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4")
 				?: summary?.selectFirst("div.post-title p.juduldepan"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/MangaDass.kt

@@ -82,7 +82,7 @@ internal class MangaDass(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(
@@ -138,7 +138,7 @@ internal class MangaDass(context: MangaLoaderContext) :
 				)
 			},
 			description = desc,
-			altTitle = alt,
+			altTitles = setOfNotNull(alt),
 			state = state,
 			chapters = chaptersDeferred.await(),
 		)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/MangaDna.kt

@@ -75,7 +75,7 @@ internal class MangaDna(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("div.hitem-rate span")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(
@@ -131,7 +131,7 @@ internal class MangaDna(context: MangaLoaderContext) :
 				)
 			},
 			description = desc,
-			altTitle = alt,
+			altTitles = setOfNotNull(alt),
 			state = state,
 			chapters = chaptersDeferred.await(),
 		)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/MangaPure.kt

@@ -89,7 +89,7 @@ internal class MangaPure(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/ManhwaHentai.kt

@@ -68,7 +68,7 @@ internal class ManhwaHentai(context: MangaLoaderContext) :
 				)
 			},
 			description = desc,
-			altTitle = alt,
+			altTitles = setOfNotNull(alt),
 			state = state,
 			chapters = chaptersDeferred.await(),
 		)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/Manhwaz.kt

@@ -78,7 +78,7 @@ internal class Manhwaz(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/ManyToon.kt

@@ -115,7 +115,7 @@ internal class ManyToon(context: MangaLoaderContext) :
 				)
 			},
 			description = desc,
-			altTitle = alt,
+			altTitles = setOfNotNull(alt),
 			state = state,
 			chapters = chaptersDeferred.await(),
 		)

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/en/ShibaManga.kt

@@ -26,7 +26,7 @@ internal class ShibaManga(context: MangaLoaderContext) :
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4")
 				?: div.selectFirst("div.post-title a"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/es/DragonTranslationParser.kt

@@ -61,7 +61,7 @@ internal class DragonTranslationParser(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img.thumb-img")?.src(),
 				title = div.selectFirst("div.series-box h5")?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/es/MangasNoSekai.kt

@@ -31,8 +31,10 @@ internal class MangasNoSekai(context: MangaLoaderContext) :
 			},
 			authors = author?.let { setOf(it) } ?: emptySet(),
 			description = body.selectFirst("#section-sinopsis p")?.text().orEmpty(),
-			altTitle = doc.selectFirst("section#section-sinopsis div.d-flex:has(div:contains(Otros nombres)) p")
-				?.textOrNull(),
+			altTitles = setOfNotNull(
+				doc.selectFirst("section#section-sinopsis div.d-flex:has(div:contains(Otros nombres)) p")
+					?.textOrNull(),
+			),
 			state = body.selectFirst("section#section-sinopsis div.d-flex:has(div:contains(Estado)) p")
 				?.let {
 					when (it.text()) {

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/es/TmoManga.kt

@@ -72,7 +72,7 @@ internal class TmoManga(context: MangaLoaderContext) :
 				publicUrl = href.toAbsoluteUrl(div.host ?: domain),
 				coverUrl = div.selectFirst("img")?.src(),
 				title = div.selectFirstOrThrow("h3").text(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = emptySet(),
 				authors = emptySet(),

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/id/ManhwaHub.kt

@@ -74,7 +74,7 @@ internal class ManhwaHub(context: MangaLoaderContext) :
 				coverUrl = div.selectFirst("img")?.src(),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4")
 				?: div.selectFirst("h5.series-title"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(

src/main/kotlin/org/koitharu/kotatsu/parsers/site/madara/ja/MangaFenxi.kt

@@ -30,7 +30,7 @@ internal class MangaFenxi(context: MangaLoaderContext) :
 				coverUrl = div.selectFirst("img")?.attr("src")?.replace("-193x278", ""),
 				title = (summary?.selectFirst("h3") ?: summary?.selectFirst("h4")
 				?: div.selectFirst(".manga-name") ?: div.selectFirst(".post-title"))?.text().orEmpty(),
-				altTitle = null,
+				altTitles = emptySet(),
 				rating = div.selectFirst("span.total_votes")?.ownText()?.toFloatOrNull()?.div(5f) ?: -1f,
 				tags = summary?.selectFirst(".mg_genres")?.select("a")?.mapNotNullToSet { a ->
 					MangaTag(