Is Kannagi: Moshimo Kannagi ga Attara... hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2009 · 1 episodes · PG-13 - Teens 13 or older
Comedy, School, Shounen, Supernatural, Visual Arts
Unaired episode included in DVD Vol.7. In this episode they attempt to make a movie with some money they found lying on the ground.
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