One night in a merchant’s mansion, a kunoichi (female ninja) named Yasuzu is violated by a group of men under the effect of “Aura of Ogre”, called “Demi-Ogre”. Although she had kept her virginity, the Demi-Ogres keeps sexually tormenting Yasuzu. Now the only thing Yasuzu can think about is her senior kunoichi Botan who she has longed for.
At midnight, in an underground prison of the mansion. Despite the physical restraints, they secretly prepare a plan for a comeback. They think that he must have a drug that controls the Aura of an Ogre because the merchant controls Demi-Ogres, thus they break out of the prison and sneak into a room where the drug is hidden. Upon getting the drug, Demi-Ogres appear in front of them. In fact, the merchant knew their scheme and has set a trap.