Shuuichirou Kudou has a problem on his hands. One night, on his way home from work, he came across a chibi angel being attacked by a crow. He rescues the angel from the crow, and takes it home with him. In exchange for saving her life, the angel, Kohaku, owes him one wish. Kudou can\'t think of anything, so Kohaku just stays in his house, watering plants and sweeping the floors. It seems Kohaku isn\'t well-adjusted to human living, however, and her efforts to help typically result in a larger mess than the one she was trying to clean up. Moreover, a demon named Kouryuu has found out where Kohaku is staying and has come to the Human plane to cause trouble for her.