Mother and former housewife Yukari, whose son has grown up and now visits less frequently, has recently begun to rediscover her identity as a woman. One day, she agrees to spend a day helping out at her son's friend's house, acting as a temporary mother figure. However, she soon finds herself drawn into a taboo affair with the young man. The long-forgotten pleasures of womanhood awaken within her once more, and her body trembles with lust and delight before the eager young men, surrendering to forbidden desire.