Is Bakuon!! OVA hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2016 · 2 episodes · PG-13 - Teens 13 or older
CGDCT, School, Seinen, Slice of Life
Bundled with the 7th and 9th volumes of the Bakuon!! manga.
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