Mitsuko Ueshima lived alone in the countryside until she decided to move in with her son and his wife in the city. Having spent lonely days before, she genuinely rejoiced in this new chapter of her life. Soon after moving in, her relationship with her son naturally grew closer, and their bond seemed stronger than ever. One day, Mitsuko is suddenly pinned down by her son, overwhelmed by his body. Filled with desires that have intensified with age, she had been secretly pleasuring herself alone each night. Her son catches her in the act and, without hesitation, roughly caresses her, grinding his groin deep against her. Though she resists, he ignores her protests and violently cums outside her body, releasing a thick stream of white fluid. A few days later, Mitsuko learns from her daughter-in-law that they’ve been in a sexless marriage, leaving her confused and wondering if she’s somehow to blame. Around this time, Mitsuko’s period ends, and a new wave of emotions begins to stir within her.