Is Diabolus: Kikoku hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2009 · 2 episodes · Rx - Hentai
Hentai
A spirit who takes the form of an attractive male is attacking many female students at a school. Two students discover that the only way to free him from his wandering around Earth is to have him fulfill his desire and so they decide to take a hands on approach and make him rest in peace at last. (Source: ANN)
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