Is Baka to Test to Shoukanjuu: Matsuri - Sentakushi Ikou nomi hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2011 · 6 episodes · PG-13 - Teens 13 or older
Comedy, School
Specials included in the Baka to Test to Shoukanjuu: Matsuri BD/DVD volumes featuring alternative endings to the OVA episodes.
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