Oni-Tensei
Japanese title: 鬼点睛
Type: OVA
Episodes: 4
Source: Original
Genres: Horror, Supernatural, Hentai
Studios: AIC
Producers: Green Bunny
Duration: 24 min per ep
Rating: Rx - Hentai

There is an ancient legend that says if a tattoo is drawn to perfection, it will come to life. Reiko Kure is a female detective with a strange massacre on her hands. Some kind of huge animal savagely murdered thirteen members of the mafia, and only the quiet Ema Nozomi was left at the scene. Ema is taken into protective custody. However, every man left with her is killed, and every woman left with her is raped. There are no clues, except the innocent Ema's strange tattoo, perfectly depicting a demon.

(Source: ANN)