Demon Warrior Koji (Series)

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)