diff --git a/src/ja/mangagun/build.gradle b/src/ja/mangagun/build.gradle
index 66c21bee3..cc1cdb8b9 100644
--- a/src/ja/mangagun/build.gradle
+++ b/src/ja/mangagun/build.gradle
@@ -3,7 +3,7 @@ ext {
     extClass = '.MangaGun'
     themePkg = 'fmreader'
     baseUrl = 'https://mangagun.net'
-    overrideVersionCode = 2
+    overrideVersionCode = 3
     isNsfw = true
 }
 
diff --git a/src/ja/mangagun/src/eu/kanade/tachiyomi/extension/ja/mangagun/MangaGun.kt b/src/ja/mangagun/src/eu/kanade/tachiyomi/extension/ja/mangagun/MangaGun.kt
index 856f5fb9c..c0d8c2f74 100644
--- a/src/ja/mangagun/src/eu/kanade/tachiyomi/extension/ja/mangagun/MangaGun.kt
+++ b/src/ja/mangagun/src/eu/kanade/tachiyomi/extension/ja/mangagun/MangaGun.kt
@@ -48,7 +48,7 @@ class MangaGun : FMReader("MangaGun", "https://$DOMAIN", "ja") {
     }
 
     override fun fetchChapterList(manga: SManga): Observable<List<SChapter>> {
-        val slug = manga.url.substringAfter("manga-").substringBefore(".html")
+        val slug = manga.url.substringAfter("raw-").substringBefore(".html")
 
         return client.newCall(
             GET(