"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! In the old building at their school, a mysterious room has a door that beckons Fumi, even though she shouldn't be able to see it! Kyutaro goes in after her, but will he be able to save her before she's devoured by otherworldly creatures?"--Back cover.