Is High School DxD Hero: Taiikukan-ura no Holy hentai?
English title: High School DxD Hero Episode 0: Holiness Behind the Gym
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

TV Special · 2018 · 1 episodes · R+ - Mild Nudity
Action, Comedy, Ecchi, Harem, Mythology, Romance, School, Supernatural
Alternative version of final four episodes of High School DxD BorN.
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