Mithril, the daughter of a viscount, had her engagement broken off because she was unattractive as a woman. As her engagement was broken, her financial support was also cut off, and Mithril thought that her family finances might be in jeopardy because of her, so she decided to work as a cleaning maid for the magician group! Her Mithril is assigned to Shisui, a group of magicians whose rooms are full of dirty rooms called Makutsu. While her other servants show reluctance, Mithril does her job efficiently, and Shisui gradually becomes more beautiful. Mithril, who doesn't flatter anyone and devotes herself to her work, is approached by the unsmiling wizard Alfried with sweet words -! ?