Maou Heika no Osouji-gakari His Majesty the Demon King's Housekeeper

Synopsis

Sakura is a high school girl who loves to clean. One day, she suddenly crashes into a Demon King from another world. Apparently, this world has fallen prey to a curse that forbids the use of cleaning magic...?! A modern-day high school student in an unknown world... can be useful by "cleaning"?! A super new and exciting otherworldly fantasy! (Source: Akita Shoten, translated)