Koji is staying at his aunt's house to attend a university outside the prefecture. He is satisfied with living under the same roof with his aunt, whom he admires, but at the same time, he can no longer stand the strong stimulation. He doesn't lay a hand on his aunt. He just borrows her used underwear for a little while... Unable to suppress his worldly desires, Koji sneaks into the dressing room, wraps his aunt's underwear around himself and masturbates with her panties, but unfortunately, his aunt finds him...