Natsuko was heartbroken after her husband died in an accident. She now lives with her daughter and son-in-law, but she sometimes feels lonely and distracts herself by masturbating. One day, she peeks into the living room and sees her daughter and son-in-law making love, and the sight brings back memories of her husband. That night, Natsuko is masturbating in the kitchen again. Her son-in-law happens to wake up and finds her. He touches her body, seeking forbidden pleasure. Natsuko knows it's wrong, but she thinks it will help her feel less lonely...