Onishi, a serial stalker murderer who was arrested in a sting operation by Detective Sakurai Ran, escapes from the psychiatric hospital where he was being held and kills two nurses. Ran and her partner, Detective Iida, try to arrest him.

Detective Sakurai is pursuing Onishi, a serial killer who uses false names to frame women one after another. However, a sting operation goes wrong and she loses her best friend, detective Hiroko. Ran vows to avenge Hiroko, who was about to get married.