Emi, who used to live in a house with her son's family and grandchildren, now lives alone. Her son or grandchildren come home occasionally, but she usually lives alone and lonely. Her only pleasures are watching tv and... her daily masturbation. One of her pleasures is thinking about what to masturbate with today. One day, while masturbating with a vibrator, her son Hiroki came home. Hiroki, who witnessed his mother masturbating, couldn't help but get an erection. And then the two of them…
