Ryota is left alone when his parents go on a trip. He is completely sulky, but his situation changes when he meets his mother's best friend, Yuki, who looks after him in place of his mother. Everyone turns their heads to look at her beauty, and Ryota's heart pounds with excitement. Ryota instantly falls in love, and with his emotions running wild, he steals her underwear. Yuki, far from getting angry, gently comforts Ryota, asking, "Are you satisfied with just underwear?"