Hikaru Otsuka, a muscular and commanding dominatrix, recruits two male masochists as training partners. To test their worthiness, she subjects them to a relentless series of brutal exercises: hellish basic training, human punching bag drills, pro-wrestling move dummies, whip endurance conditioning, face-sitting breath control training, self-defense practice, horseback riding drills, choke-drop training, cunnilingus machine training, human training equipment duty, foot-licking cleaning drills, anal stretching development, water torture via shower, underwater cunnilingus special training, and use as human toilets—repeatedly tormenting them while building their strength and stamina.