Years after losing her beloved husband, Nobuko now lives peacefully with her daughter and son-in-law, maintaining a stable and harmonious household. However, one day, her son-in-law, Yukio, accidentally discovers Nobuko masturbating. From that moment on, the image of her beautiful yet unsettling figure becomes deeply etched in his mind. Later, during a quiet day alone together, memories of her silhouette resurface, and the scene replays vividly in his thoughts. Overwhelmed by uncontrollable desire, his suppressed excitement finally erupts beyond restraint.