QQ Sweeper Volume 1 (Paperback) by Motomi Kyousuke
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 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?