Is Hakuouki: Hekketsuroku - Kyoto Kaisouroku hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

TV Special · 2010 · 1 episodes · R - 17+ (violence & profanity)
Action, Drama, Historical, Josei, Samurai, Supernatural
Summary of the first season of Hakuouki Shinsengumi Kitan. Aired the week before the second season began.
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