“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.