Sana's second husband had two stepchildren. One day, she thought she had completely blended into the family, but Sana was secretly filmed masturbating by her younger brother Kenji and coerced with 'Isn't Dad enough for you?' She gave in to him. Then, to counter his younger brother, her older brother raped Sana's anus and cruelly imprisoned her in a ruin. The stepmother became a sex slave to the stepchildren…
