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

OVA · 2014 · 3 episodes · PG-13 - Teens 13 or older
Action, Ecchi, Fantasy, Historical, Martial Arts, Samurai, Shounen
OVAs bundled with the 15-17th volumes of the Mushibugyou manga.
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