Prisoner No. 407: A Vow of Revenge Made Behind Bars Nami had missed her chance to marry while helping out at her father’s small factory and was now in her late twenties, but she became engaged after receiving a confession from a bank employee named Imoshima, who worked for one of her father’s clients. However, on the night before her wedding, Nami was attacked by a factory worker and stabbed him in self-defense, resulting in a prison sentence for excessive self-defense. …But it was all part of Imajima’s scheme. Imajima’s true target was the patent held by Nami’s father, and his goal was to steal it. Sold into the prison as a sex slave, Nami endured countless acts of humiliation, gradually transforming into a cold, emotionless woman…