Is Owari no Seraph: The Beginning of the End hentai?
English title: Seraph of the End: The Beginning of the End
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 1 episodes · R - 17+ (violence & profanity)
Action, Drama, Fantasy, Shounen, Vampire
Recap of 1st Season Aired Before Nagoya Kessen-hen.
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