Ruka, a housewife, is enjoying a happy newlywed life with her husband. But one day, her father-in-law suddenly appears at their home and begins repeatedly harassing her. When her husband is away, he secretly takes photos of her sleeping with his phone and openly subjects her to sexual harassment. His actions gradually escalate into forced blowjobs, vibrator torture, and tampering with her pantyhose—crossing every boundary. Unable to tell her husband the truth, Ruka suffers in agony day after day, but her father-in-law's wicked deeds show no sign of stopping, and eventually, his advances begin to invade even her heart.