After her husband's passing, Fumie lives alone with her son. As her son grows older, she gradually begins to rediscover her own femininity. One day, learning that her son's friend, Matsuda, is without parental care, Fumie decides to step in as his temporary mother for just one day. As she takes care of him at his home, their bond slowly deepens. Forbidden emotions begin to stir, driving both of them toward an uncontrollable desire. In response, Fumie's body awakens as well, giving rise to a new and illicit relationship.