A woman calling herself Princess Oryu enters the woman's prison. She is Kasumi, the daughter of the famous magistrate, Ooka Echizen, who slowly after hearing each of the prisoner's stories begins to realize the mystery that lies behind what it could be a big conspiracy.
The government is worried that the Emperor will have no children because he can’t get an erection. The female ninjas try to find a sacred book that will help him, but they face a stiff challenge.
The female ninjas have to stop an alliance from carrying out their dastardly deeds, which includes bizarre ninjitsu sex magic to aid them in their quest.
