Maou Heika no Osoji Gakari

Synopsis:

Sakura is a cleaning enthusiast and a high school student. She unexpectedly runs upon a Demon King from another world one day. It seems that a curse has been placed on this globe prohibiting the use of cleansing magic. Can a high school student in the present day, in a foreign land, be useful by "cleaning"? An incredible fresh and thrilling fantasy from another world...