Honoka Oshita, a lazy girl who is not good at housework, but lives her high school life as an outwardly perfect character, has to start living alone for a limited period of time due to her mother's business trip abroad. Her mother asks Akira Katsuragi, the most handsome man in her class, to be her housekeeper!　When he sees Honoka's disheveled appearance, he says, "Won't you be my girlfriend?"

The two end up living together and signing a lover's contract!