Is Owaranai Seraph hentai?
English title: Seraph of the Endless
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 9 episodes · PG-13 - Teens 13 or older
Comedy, Shounen, Supernatural, Vampire
Specials included in the Blu-ray and DVD releases.
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