Chisato was worried... Just when I was relieved that my painful menopausal symptoms had subsided, I felt a stronger sexual desire than ever before. After doing some research, I discovered that "after menopause, women's sexual desire can increase due to an increase in male hormones." One day, Chisato finds herself alone with her daughter's husband. Coincidentally, her husband hadn't had sex with her while her daughter was pregnant. When Chisato found out, she made advances on her daughter's husband... "There's no need to be shy. I know how painful it is to hold back your sexual desires." Until this age, Chisato had maintained her rationality and lived an honest life, but now her rationality is broken and she is drowning in instinct and pleasure.