Rengou no onna.

Sachi runs an AV production company, that is attached to the Teito syndicate (="rengō"). She meets Mika, who has applied to become an AV actress in order to pay off her boyfriend's debts. When Sachi finds out that Mika is being abused by her boyfriend, she comes up with a plan to trap him and extort money from him. However, her boyfriend is backed by Madarame of the rival Daikyo syndicate. Madarame is none other than the one who raped Sachi when she was a high school girl. And so begins the conflict between the Teito and Daikyo syndicates.