Mari, the mother, visits her daughter's home out of concern for her daughter who is upset after a fight with her husband. Staying with the family for a while, she begins to feel the warmth of family life, but Akira, her son-in-law, seems constantly restless. One day, as Mari is changing clothes in the changing room before taking a bath, she notices Akira secretly watching her. Shocked and flustered, Mari is left speechless. That night, Akira quietly sneaks into her room. Caught off guard, Mari stands frozen in confusion. Tension and anxiety intertwine as an unexpected turn of events unfolds.