Sayako became pregnant with her son Tatsuya during her college years, and despite strong opposition from those around her, she raised the child alone. Tatsuya has finally secured a job and become independent, yet even now as an adult, they barely speak to each other, living separate lives. Worried about his well-being, one night Sayako discovers Tatsuya masturbating. Seeing this, she feels something must change, and decides to invite him to a hot spring inn for a long-overdue conversation.