QQ Sweeper

QQ Sweeper (QQ スイーパー, Kyūkyū Suīpā) is a manga by Kyousuke Motomi. It ran in the Betsucomi manga anthology magazine starting in March 2014 and ended in May 2015. It is complete in 3 volumes. A sequel, Queen's Quality, is currently being serialized. It has been licensed for English release by Viz Media.

Plot
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! (Official Synopsis)

Official
Official English site