Kyutaro Horikita, the tall, dark and handsome cleaning expert of Kurokado High, is about to meet a sleeping maiden at the school: transfer student Fumi Nishioka! Fumi's going to learn how to rid the school of nasty spirits with Kyutaro's help, and her heart will surprisingly be "cleansed" too…!

Fumi's image keeps overlapping with that of Fuyu, Kyutaro's childhood crush, who remains in his thoughts to this day. Meanwhile, Fumi starts to work as a Sweeper with Kyutaro's family, but she struggles with keeping her past a secret. Has Fumi finally found a place to call home or will her cursed past catch up to her?