Board Thread:Questions and Answers/@comment-130.105.193.137-20160508052416/@comment-25942629-20160509233148

The anime isn't anime-original. It's just based on the manga, so it would have to divert completely from the manga or load it with fillers if WIT Studios wanted to rush it.

The end of season 2 caught up with the manga, although it changed the ending a bit and left out a ton of smaller events during that arc. The manga is still ongoing and published in the English Weekly Shonen Jump on a monthly basis. Since each ep covers roughly one chapter (one month of waiting IRL), I wouldn't expect another season until the very end of this year or sometime next year at the very earliest. In the meantime, the manga is much more refined than the anime and I strongly recommend it!

Anime-wise, Vampire Shahal/Shahar OVA is out and is anime-only, so it's not canon. There are raws floating around everywhere, but the subs aren't out yet.

Here are a couple of other threads discussing this topic:

http://owarinoseraph.wikia.com/wiki/Thread:13160

http://owarinoseraph.wikia.com/wiki/Thread:10875