Chisato had been struggling... She had endured difficult days due to menopausal symptoms, but finally those symptoms had settled, bringing her a sense of peace. However, at the same time, she was suddenly overwhelmed by an intense sexual desire unlike anything she'd ever felt before. Researching online, she learned that "after menopause, increased levels of male hormones in women can lead to heightened libido." She continued satisfying these urges alone, day after day. Then one day, she found herself alone with her daughter's husband, a man who was already suffering from a sexless marriage with her daughter. Learning this, Chisato made her move. "Don't hold back. Suppressing your desires is truly painful." Until now, Chisato had lived seriously and rationally—but that rationality begins to crumble as she surrenders herself completely to raw instinct and pleasure. The moment she takes that first step, her life changes forever.