Kamisama Dolls

Kamisama Dolls (神様ドォルズ) is a manga by Hajime Yamamura. An anime adaptation started airing on July 6, 2011.

Story
Kyouhei, after moving away to Tokyo from his old town to get away from the events that happened, is on a group date with his friends, including his old neighbor, Shiba. After drinking for a whole night, he and Shiba discover a dead, bloody, body in the elevator. He is told by his younger sister, Utao with her Kamisama Doll, that Aki, an old friend, and his Doll, are the culprits responsible.