Is Fuyu no Semi Special hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

OVA · 2008 · 1 episodes · R - 17+ (violence & profanity)
Action, Boys Love, Drama, Erotica, Historical, Military, Samurai
Summary of the Fuyu no Semi OVA with revised animation and some extra scenes.
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