Mai, who grew up in a single-parent household for many years, was taken by her mother, who recently remarried, to live with her new husband. Her mother's new husband is kind and financially stable. "Don't be shy, just think of this house as yours, Mai-chan," the middle-aged man said as he welcomed her, but Mai was confused by the lewd gazes that had obvious sexual overtones at key points, and lived her life well. But then, one night in her bedroom...