diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/queries/MangaQueries.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/queries/MangaQueries.kt
index a5b3a4da8..a27a11c34 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/database/queries/MangaQueries.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/queries/MangaQueries.kt
@@ -6,10 +6,7 @@ import com.pushtorefresh.storio.sqlite.queries.RawQuery
 import eu.kanade.tachiyomi.data.database.DbProvider
 import eu.kanade.tachiyomi.data.database.models.LibraryManga
 import eu.kanade.tachiyomi.data.database.models.Manga
-import eu.kanade.tachiyomi.data.database.resolvers.LibraryMangaGetResolver
-import eu.kanade.tachiyomi.data.database.resolvers.MangaFavoritePutResolver
-import eu.kanade.tachiyomi.data.database.resolvers.MangaFlagsPutResolver
-import eu.kanade.tachiyomi.data.database.resolvers.MangaLastUpdatedPutResolver
+import eu.kanade.tachiyomi.data.database.resolvers.*
 import eu.kanade.tachiyomi.data.database.tables.CategoryTable
 import eu.kanade.tachiyomi.data.database.tables.ChapterTable
 import eu.kanade.tachiyomi.data.database.tables.MangaCategoryTable
@@ -80,6 +77,11 @@ interface MangaQueries : DbProvider {
             .withPutResolver(MangaFavoritePutResolver())
             .prepare()
 
+    fun updateMangaViewer(manga: Manga) = db.put()
+            .`object`(manga)
+            .withPutResolver(MangaViewerPutResolver())
+            .prepare()
+
     fun deleteManga(manga: Manga) = db.delete().`object`(manga).prepare()
 
     fun deleteMangas(mangas: List<Manga>) = db.delete().objects(mangas).prepare()
@@ -108,4 +110,4 @@ interface MangaQueries : DbProvider {
 
     fun getTotalChapterManga() = db.get().listOfObjects(Manga::class.java)
             .withQuery(RawQuery.builder().query(getTotalChapterMangaQuery()).observesTables(MangaTable.TABLE).build()).prepare();
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/resolvers/MangaViewerPutResolver.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/resolvers/MangaViewerPutResolver.kt
new file mode 100644
index 000000000..86c67f346
--- /dev/null
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/resolvers/MangaViewerPutResolver.kt
@@ -0,0 +1,32 @@
+package eu.kanade.tachiyomi.data.database.resolvers
+
+import android.content.ContentValues
+import com.pushtorefresh.storio.sqlite.StorIOSQLite
+import com.pushtorefresh.storio.sqlite.operations.put.PutResolver
+import com.pushtorefresh.storio.sqlite.operations.put.PutResult
+import com.pushtorefresh.storio.sqlite.queries.UpdateQuery
+import eu.kanade.tachiyomi.data.database.inTransactionReturn
+import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.database.tables.MangaTable
+
+class MangaViewerPutResolver : PutResolver<Manga>() {
+
+    override fun performPut(db: StorIOSQLite, manga: Manga) = db.inTransactionReturn {
+        val updateQuery = mapToUpdateQuery(manga)
+        val contentValues = mapToContentValues(manga)
+
+        val numberOfRowsUpdated = db.lowLevel().update(updateQuery, contentValues)
+        PutResult.newUpdateResult(numberOfRowsUpdated, updateQuery.table())
+    }
+
+    fun mapToUpdateQuery(manga: Manga) = UpdateQuery.builder()
+        .table(MangaTable.TABLE)
+        .where("${MangaTable.COL_ID} = ?")
+        .whereArgs(manga.id)
+        .build()
+
+    fun mapToContentValues(manga: Manga) = ContentValues(1).apply {
+        put(MangaTable.COL_VIEWER, manga.viewer)
+    }
+
+}
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt
index 98ec66ae2..9861e288c 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt
@@ -99,7 +99,7 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>() {
 
         fun newIntent(context: Context, manga: Manga, chapter: Chapter): Intent {
             val intent = Intent(context, ReaderActivity::class.java)
-            intent.putExtra("manga", manga)
+            intent.putExtra("manga", manga.id)
             intent.putExtra("chapter", chapter.id)
             return intent
         }
@@ -117,10 +117,10 @@ class ReaderActivity : BaseRxActivity<ReaderPresenter>() {
         setContentView(R.layout.reader_activity)
 
         if (presenter.needsInit()) {
-            val manga = intent.extras.getSerializable("manga") as? Manga
+            val manga = intent.extras.getLong("manga", -1)
             val chapter = intent.extras.getLong("chapter", -1)
 
-            if (manga == null || chapter == -1L) {
+            if (manga == -1L || chapter == -1L) {
                 finish()
                 return
             }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt
index 50931553e..ab8b56ee8 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt
@@ -157,11 +157,27 @@ class ReaderPresenter(
         return manga == null
     }
 
+    /**
+     * Initializes this presenter with the given [mangaId] and [initialChapterId]. This method will
+     * fetch the manga from the database and initialize the initial chapter.
+     */
+    fun init(mangaId: Long, initialChapterId: Long) {
+        if (!needsInit()) return
+
+        db.getManga(mangaId).asRxObservable()
+            .first()
+            .observeOn(AndroidSchedulers.mainThread())
+            .doOnNext { init(it, initialChapterId) }
+            .subscribeFirst({ _, _ ->
+                // Ignore onNext event
+            }, ReaderActivity::setInitialChapterError)
+    }
+
     /**
      * Initializes this presenter with the given [manga] and [initialChapterId]. This method will
      * set the chapter loader, view subscriptions and trigger an initial load.
      */
-    fun init(manga: Manga, initialChapterId: Long) {
+    private fun init(manga: Manga, initialChapterId: Long) {
         if (!needsInit()) return
 
         this.manga = manga
@@ -180,6 +196,7 @@ class ReaderPresenter(
             .fromCallable { chapterList.first { chapterId == it.chapter.id } }
             .flatMap { getLoadObservable(loader!!, it) }
             .subscribeOn(Schedulers.io())
+            .observeOn(AndroidSchedulers.mainThread())
             .subscribeFirst({ _, _ ->
                 // Ignore onNext event
             }, ReaderActivity::setInitialChapterError)
@@ -374,8 +391,7 @@ class ReaderPresenter(
     fun setMangaViewer(viewer: Int) {
         val manga = manga ?: return
         manga.viewer = viewer
-        // TODO custom put operation
-        db.insertManga(manga).executeAsBlocking()
+        db.updateMangaViewer(manga).executeAsBlocking()
 
         Observable.timer(250, TimeUnit.MILLISECONDS, AndroidSchedulers.mainThread())
             .subscribeFirst({ view, _ ->