When Tamiya and Otaki buy a "Demons" CD from a pawn shop, they inadventantly release the demon Marller.  This is a demon that Belldandy and Urd had once sealed.  Marller, wanting revenge on the two goddesses, disguises herself as a Tanuki statue in Keiichi's room.  She turns Keiichi into a scooter and the two goddesses must work to find Marller in order to get Keiichi back to normal.