Having grown up in an institution, Mao Hamasaki carried deep guilt over her past—until she met her husband and built a happy marriage. But after her mother-in-law's sudden death, the couple began living with her father-in-law. One day, he accidentally discovered that Mao had once worked in the sex industry. Using this secret against her, he began threatening her. "You wouldn't want this getting out, would you?" he sneered, pulling a hemp rope from the cupboard. What followed was a violent assault disguised as "training," as he began to tie her up and dominate her. This series of events would drastically alter Mao's life forever.