Instead of her parents going on a trip, her mother's best friend, Nina, will take care of her. - An explosive body that everyone is riveted to by a dignified and beautiful face. - The room of an adult who does not pay attention to the slightest glance of Koji, who seems to bite. Koji, who fell in love with him in an instant, desperately turns his head to see if he can somehow bring it to a good atmosphere. But for Nina, she's a child. Koji, who became desperate if he was not dealt with anyway, goes on a rampage of stealing Nina's underwear. Nina, who thought Koji's mischief was cute, gently hugged her, saying, "It's a child who can't be helped, I'll tell you a secret place that makes women happy."