Diabolus: Kikoku
Japanese title: Diabolus～鬼哭～
Type: OVA
Source: Visual novel
Episodes: 2
Status: Finished Airing
Aired: Dec 21, 2009 to Feb 26, 2010
Duration: 28 min per ep
Rating: Rx - Hentai
Studios: PoRO
Genres: 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)