QQ Sweeper Vol. 1 (manga)

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 !
In the old campus of their school, a mysterious room has a door that beckons Fumi, even though she shouldn t even be able to see it! Kyutaro goes in after her, but will he be able to save her before she gets devoured by otherworldly creatures?