Yuriko, the mother of her only son Kota, has been overly caring for him and raising him. Feeling a sense of crisis, Kota decides to leave his parents and start living on his own, but Yuriko doesn't seem to care and starts frequenting his apartment almost every day. Kota treats Yuriko coldly and tries to distance herself from her, but Yuriko is so lonely that she begins to do something forbidden!!