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

OVA · 2011 · 2 episodes · PG-13 - Teens 13 or older
Action, Drama, Historical, Samurai, Supernatural
Two short OVA of Hakuouki distributed to those who purchased all six volumes of the DVD. A fandisc game "Hakuoki Zuisouroku" and an official parody "Hakuoki SSL (a high school parody)" were animated.
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