After losing her husband, Nao raised her son alone. As he reached adolescence, he gradually became distant and cold toward her. But one day, his attitude suddenly changed, and he began treating her with unexpected kindness. Surprised by this shift, Nao starts to suspect her son has found a new romantic interest—triggering a mother's inner turmoil at the thought of him being seduced by another woman. Faced with this emotional crisis, what decision will Nao ultimately make?