Is Gakuen 3 hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2011 · 2 episodes · Rx - Hentai
Hentai
Since Kagetora doesn't study at all, he is sent to a strict boarding school. One day, he meets three beautiful girls at school and falls in love with them.... To have sex with them, he makes a secret plan... (Source: ErogeShop)
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