A police detective known to his colleagues as Yousuke Kobayashi; an inoffensive family man tracking down a serial killer who mutilates his victims by severing their limbs. When the killer sees Yousuke on television he claims to recognize something in the detective and mutilates Yousuke's girlfriend. Yosuke eventually tracks down the killer at which point a new personality called Shinji Nishizono, an arrogant and callous psychopath, emerges and shoots the killer.