Spirits in the shape of maids, also known as "Step-Girls," are going around putting people in danger by repeatedly performing twisted services. There is only one way to exterminate those girls: A "Master" must accept their services.
A boy, unable of ignoring another person's feelings, Kotomi, is discovered to be such a "Master" by a maid he has never once met before, Ursula.

By the creator of "The Girl I Like Forgot Her Glasses," Fujichika Koume, comes a suspense action story between a master and his maid.

(Source: Square Enix, translated)