After Keita brings his girlfriend home, his mother begins to feel a mix of maternal joy and hidden jealousy. While genuinely moved by her younger son's growth, she gradually develops an overwhelming desire to keep him all to herself, unable to bear the thought of losing him to anyone else. This possessive emotion intensifies until she directs dangerous advances toward her eldest son. A mother's excessive love slowly twists her heart into something unrecognizable. As her complex inner desires collide with her sons' futures, the situation spirals into increasingly dangerous territory.