Reiko, who had lost her husband and was living alone, was worried about her. Her daughter and her husband moved in, and Reiko seemed happy to be surrounded by her new family. However, as she heard the sounds of her daughter and her husband having sex at night, she gradually found it difficult to hide her sexual desire. One day, while cleaning her daughter and her husband's room, she found a used condom in the trash can, and became so excited that she started anal masturbating right there.