One day, Kyutaro Horikita, the tall, dark and handsome cleaning expert of Kurokado High, comes across a sleeping maiden named Fumi Nishioka at school... Unfortunately, their meeting is anything but a fairy-tale encounter! It turns out Kyutaro is a "Sweeper" who cleans away negative energy from people's hearts--and Fumi is about to become his apprentice!

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?