那美は父親の町工場を手伝うちに婚期を逃しアラサーになっていたが、取引先の銀行員・妹島の告白を受け婚約。しかし結婚式を目前に控えた夜、工員に襲われた那美は男を刺してしまい、過剰防衛として懲役刑に処されてしまう。…しかし、すべては妹島の策略。妹島の狙いは那美の父親が持つ特許（パテント）でありそれを奪う事だった。 刑務所に性奴●として売られた那美は数々の凌●を耐え忍ぶうちに、感情の無い冷徹な女となっていく…。

Nami, who had missed her chance to marry while helping out at her father's small factory, was in her late twenties when she received a confession from Sejima, a bank employee at one of their business partners, and became engaged. However, the night before her wedding, Nami was attacked by a factory worker and stabbed him, resulting in her being sentenced to prison for excessive self-defense. …But it was all part of Sejima's plan. Sejima's target was the patent held by Nami's father, and he wanted to steal it. Sold into prison as a sex slave, Nami endured numerous abuses, and as she did so, she became a cold, emotionless woman…