Mashiro Kimura fights demons that threaten peace as Pretty Soldier Sailor Bell. One day, he encounters Dr. Aida, a mentor of beautiful girl warriors, being attacked by combatants. With the doctor held hostage, Bell is taken to a demon's hideout and injected with aphrodisiac poison. Bell, whose pleasure center is stimulated by the poison, is humiliated by the combatants, and in order to protect the doctor, he betrays his friends and follows the devil's orders. Bell, who is finally in heat, is trained in pleasure by the technician General Geller and turns into a female servant. [BAD END]