Another XX: Black Stalker.

A raped woman appears before Kyoko. Natsumi, the boss of a gang of delinquents she knows, and her friends are also raped and humiliated by a rapist. Apparently, it is the same rapist. And it is a duo. As Kyoko and Natsumi begin to make their move, they discover that a mysterious beautiful girl named Emu is involved in the case. Kyoko also receives a letter from the rapist warning her about the case. Despite police security, Kyoko falls prey to the rapist, but manages to wound the perpetrator. However, a man is found dead with the same wounds... The case takes an unexpected turn when an unidentified person named “Dead Angry” becomes involved.