Tokyo Babylon

Tokyo Babylon (東京 BABYLON, Tōkyō Babiron), also known as Tokyo Babylon: A Save Tokyo City Story, is a shōjo manga series created by Clamp, with story by Nanase Ohkawa and art by Mokona.

Plot
Subaru Sumeragi is the 13th head of the Sumeragi Clan and a most powerful onmyouji. Subaru is hired to exorcise a construction site, but his employer mysteriously died. The only suspect is a man who repeatedly walks away from situations in which he should have died. Then Subaru meets a young woman intent upon cursing the man, saying that he killed her brother. Subaru must figure out how his employer died and fight the evil spirits that are protecting the man with the help of his friend, Seishiro Sakurazuka and twin sister, Hokuto Sumeragi.