Is Kyou no 5 no 2 (TV): Takarabako hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2009 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Ecchi, School, Seinen
An OVA bundled with the limited edition of the tankobon of the Kyou no Go no Ni manga. The staff and the cast of the OVA are the same as those of the Kyou no Go no Ni TV anime.
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