Hiroyuki is a 16-year-old boy who is starting high school and beginning to live alone. He secures a great deal on a house to rent, even though it is a bit run-down, but there is one small problem. The current occupant of the house is a cute demoness named Milky Way... and Milky needs a servant. Hiroyuki's peaceful life is about to become entwined in the chaos of heaven, hell, and love triangles!