Hiroyuki is a 16 year-old boy who is just starting a life of living on his own. He finds a great deal on a huge house for only 10,000 yen a month in rent. Sure the house is a little run down and perhaps even downright spooky, but it's better than nothing...until he meets Milky Way! Milky Way is a Demoness and she has her eyes set on making Hiroyuki her servant!