>Shiori is troubled by the fact that her only son, Mamoru, has stopped attending school while her husband is away on an assignment. >Her husband is too busy with work to talk to her about it, she has no friends she can talk to because of her introverted personality, and there are no relatives nearby that she can rely on... >Mamoru's childhood friend, Shingo, presses her into a relationship on the condition that she helps him... >Shiori accepts his demands for Mamoru's sake. >Shiori, who has never known any other man but her husband, is at the mercy of a young, strong body that is different from her husband's...