Manami, the sole survivor of Angel of Darkness 2, is rushed to hospital where she slips into a deep sleep. A priest correctly suspects that the demon (now referred to as an Injuu) is inside Manami's body, but by the time he is able to confirm his theory, the creature has already moved on. As before, the tentacled beastie passes from host to host (by thrusting its slimy appendages into its victims' orifices), eventually ending up inside goody-goody schoolgirl Fumie, who does her best 'Linda Blair' impersonation for a while, before the priest inevitably turns up to save the day.
After an assignment-gone-wrong, Keisuke decides to quit Rapeman services, leaving Uncle to take his place. All the while, they are targeted by one of their previous victims, who has hired a Rapeman look-a-like to tarnish our hero's good name and attack Keisuke's closest friends. Has Rapeman finally met his match? Tune in to find out! Same rape time, same rape station.