Shiho's father-in-law, believing his wife ran off with a man better in bed than him, could no longer suppress his twisted desires and began taking them out on his son's wife, Shiho. Meanwhile, feeling neglected as her husband was too preoccupied with work troubles to listen, Shiho reluctantly succumbed to her father-in-law's intense domination, torn between regret and guilt. Trapped by the belief that she had no way to protect herself other than submitting, she found herself unable to escape the ongoing relationship with her father-in-law.