Is Gosick: Utsukushiki Kaibutsu wa Konton no Sen wo Shimiru hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

TV Special · 2011 · 1 episodes · R - 17+ (violence & profanity)
Historical, Mystery
Recap episode. The first part of the episode consists of the recap, the second part consists of some interviews with the cast.
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