In this adult school role-play, Hayami is his closest friend, but her boyish clothes and personality mean he has never thought of her as a woman. One day he impulsively grabs her full breasts while she changes, and her aroused reaction makes him cross the line. From then on they cannot keep their hands off each other, fooling around at school and on the train. With every kiss and deep thrust, Hayami grows cuter and more openly lustful, until they fuck on pure instinct and make each other cum again and again.