Is Ao no Exorcist: Ura Ex hentai?
English title: Blue Exorcist: Ura Eku
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2011 · 10 episodes · PG-13 - Teens 13 or older
Comedy, Shounen
Ura Ex, extra short anime included in Blu-ray and the DVD releases of Ao no Exorcist.
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