Yuusuke's father has moved abroad, and now Yuusuke has the house to himself. However, on his way to school, he stumbles upon (actually, falls on top of) a naked, sleeping girl in the forest, with a halo over her head. He runs away when she wakes up and declares that he's her husband, but he can't escape her - she's the new student in his class! Noelle follows Yuusuke home, and he discovers that her family of demons from the underworld have moved in - and redecorated.