Thread:ResidentialPsycho/@comment-27090820-20151109000228/@comment-25942629-20151109020526

The only extra episode I know of so far is the bonus one recapping the first season. I don't have any information about an anime-only story. The art with that character is consistent with the anime art in Seraph, but it could still just be something fan-made. I didn't find any information about an OVA or that character on the official anime site. I also didn't see anything about it on the manga site or Seraph twitter.

Of course, they only give limited info. Can you link your source for that character information? Before doing anything, it's important to make sure it's legit.