Is Gokujo.: Gokurakuin Joshikou Ryou Monogatari hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2012 · 12 episodes · PG-13 - Teens 13 or older
Comedy, Ecchi, Girls Love, School, Seinen
A story about the humorous misadventures of Akabane Aya, an arrogant high school girl who's constantly trying to outdo her classmates in everything, especially sex appeal, only to make a fool of herself in the process.
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