It could be that the manga you're looking for has been removed due to copyright issues or changes in the app's content policy. Also, sometimes there are technical glitches that prevent certain manga from showing up.
Maybe the app has been shut down or its manga library has been updated and some titles are no longer available.
It could be that Manga Rock has run into legal troubles and had to remove its manga content. Or, there might be server problems or maintenance going on that's preventing you from finding what you're looking for.
There could be several reasons. Maybe the popularity of Berserk led to it being taken down from Manga Rock. Another possibility is that there were legal complications preventing its availability on that particular platform.
Maybe Manga Rock doesn't have the license to host Tokyo Ghoul or it could have been removed due to copyright issues.
Manga Rock was shut down due to copyright infringement. So, you won't be able to find One Piece or any other manga there anymore.
Maybe it's because Manga Rock was shut down for copyright infringement. So, you won't be able to link to it.
Sometimes, the app might have been removed from the app store or there could be a problem with the version you're trying to install. Try looking for updates or alternative sources.
Maybe it's not available on that specific app. Sometimes, licensing and distribution rights can limit where certain manga are accessible.
It's hard to say for sure. Sometimes the availability of certain manga on an app depends on regional restrictions or partnerships. It's also possible that there were copyright issues that led to its removal.
Maybe your device doesn't meet the app's system requirements. Check if your OS version is compatible.
It could be a technical glitch. Sometimes the app has temporary issues. Try restarting your device or reinstalling the app to see if that helps.