Mio was born in the village of Iga and raised as a female ninja. She usually lives a peaceful life as a village girl, but when she receives a secret letter from the dying Yaichi, her days of hardship begin. Pursued by her former comrade Hanzo and his gang, Mio is unable to escape and challenges them head on, but she is forced into a difficult battle against several men and is captured. When Mio wakes up, still in a daze, she finds herself being trained by lust-filled men...