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

OVA · 2013 · 1 episodes · PG-13 - Teens 13 or older
Adult Cast, Comedy, Otaku Culture, Parody, Seinen
Bundled with the limited edition of the 15th volume of the manga.
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