After her husband died in an accident, Shihori has been living with her daughter. A few months ago, her daughter got married, and now they live together as a family of three. Shihori has a problem. It's that her daughter's husband is always making out with her in front of her, without a care in the world. Shihori has been trying to cope by masturbating while smelling her son-in-law's underwear, her body heating up. That day, she caught her daughter and son-in-law having sex. Remembering that, Shihori masturbates intensely, and blurts out her son-in-law's name. Just then, her son-in-law appears and embraces Shihori...