Reiko, who married an older man 20 years ago, gave up on her sexless marriage and began an affair with Taichi, a junior at work. She loves Taichi, who still has a boyish side, and has been in a relationship with him for three years, ignoring her family matters. Then, one spring, Reiko invites Taichi on a road trip, looking for an extraordinary sexual encounter. On the road, Reiko enjoys playing with Taichi's young body...