Young wife Miharu becomes interested after seeing a volleyball club recruitment flyer and decides to join officially starting next week after observing practice. Once training begins, Miharu is put through intense drills by team captain Natsumi, who gives her a strange smile as she struggles earnestly through the grueling workouts. As practices continue, their relationship gradually deepens and grows more intimate. One day, Miharu invites Natsumi to her home, setting the stage for a new development.