After losing her husband, Ryoko decided to live with her daughter and son-in-law. However, her peaceful life only made her more and more frustrated. Masturbation became a daily routine, and it became more and more extreme with each passing day. Ryoko's sexual desire was too strong for her to retire. She just wanted a man, anyone would do. Just as she was in that mood, her stepson asked her to have a forbidden relationship. Her stepson witnessed Ryoko masturbating and was fascinated by her eroticism. Ryoko refused, saying it would be bad for her daughter, but at the same time, she felt her body getting hot and wet.