Kairaku Satsujin Chousakan Kouji
English title: Demon Warrior Koji
Japanese title: 快楽殺人調査官 コージ
Type: OVA
Episodes: 3
Source: Unknown
Genres: Hentai
Studios: Phoenix Entertainment
Duration: 42 min per ep
Rating: Rx - Hentai

From the creator of Urotsukidoji: Legend of the Overfiend, La Blue Girl, and Demon Beast Invasion! A monster is out for blood, and only the man-demon Koji can hunt down the preternatural killer. Aided by a morbid psychic, he follows the grisly trail of victims to a lonely woman. What unspeakable horrors will he find? And are even Koji's powers enough to curb this devastating threat?

(Source: AniDB)