Joshû 701-gô: Sasori Gaiden plot
Nami Matsushima, inmate #701, is sent to a women's prison for attempted murder. In prison, she is attacked by a group and she bites off a toe on one of them. In the isolation cell she begins to think about her past. Nami had a lover, Sugimi, a successful business leader in the IT world. One day he introduced Nami to a young man named Kurata. Sugimi also secretly owned a call girl club and sold her to Kurata, who raped her. Kurata bought a prison guard with orders to kill her in prison. But Nami escaped from prison and is now seeking revenge.