After losing her husband, Ryoko accepted living alone with her stepson without resistance. However, the son remained acutely aware of their situation, creating subtle tension between them. One afternoon, while Ryoko was bathing, she suddenly felt an intense gaze from behind. Turning around, she saw her stepson peering at her back. Confronting him about it, his response was completely unexpected. The emotions that began to stir between them gradually grew deeper.