Half Gray Woman

Hachioji North Technical High School is notorious for its delinquents. Rina, a recent transfer student, finds herself harassed by some of them—until she's rescued by Kaito. Unlike the other delinquents, there's something different and compelling about him, and Rina begins to feel drawn to him. But her involvement catches the attention of Suzumiya, the reigning queen and feared "shadow boss" of the school, who also happens to be Kaito's childhood friend…

Following the accidental death of the head of the legendary biker gang Omiya Strikers, "Garou no Shinnosuke," a conflict breaks out between two major factions within the Strikers over the vacant position. However, to become the next head, one must have the legendary motorcycle left behind by Shinnosuke. Then, his younger sister Maki (Sakurai Ayu) suddenly emerges as a candidate for the position. Maki is confused, but her inherited delinquent blood awakens.

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.