Three years after marrying Kazunori, Mei began living with her father-in-law. Her relationship with her husband had deteriorated, leading to a sexless marriage, while her father-in-law subjected her to constant sexual harassment. One day, as Mei was masturbating alone, she was caught by her father-in-law. Though she gently tries to resist his persistent advances, his slick, relentless foreplay gradually turns into overwhelming pleasure. As her inner desires begin to shift, the story unfolds.