The day Rieko's ordinary life suddenly changes, Kiyoshi, her son's childhood friend, pays her a visit. Kiyoshi was once the boy to whom Rieko had given advice about adolescent sexual concerns. That experience left an unforgettable impression on him, and he has kept Rieko in his heart ever since. When Kiyoshi murmurs the words "she's no longer here," Rieko senses something stirring within. What emotions are beginning to awaken inside her?