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

ONA · 2011 · 7 episodes · PG-13 - Teens 13 or older
Comedy, School, Sci-Fi
A school comedy taking place in Tokyo in 2034. Copihan is a joint project of Gonzo and Kei, the illustrator of the manga version of Copihan who is best known for Hatsune Miku.
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