Kunoichi Rui is an outcast from a ninja village. He was unable to keep up with his training and became a chore clerk. Frustrated, Rui practiced on her own and gained skills. One day, Rui asked a Jonin to practice swordsmanship. At first, the Jonin reluctantly takes on Rui, but is surprised by Rui's ability. He admits that Kami is also good at swordsmanship, but says that a kunoichi is useless if he can't use sex techniques. Rui said, ``I'll endure any kind of training,'' and from that day on, the training in sex techniques began. Rui's whole body is smeared with a secret medicine, and a potato stalk is inserted into his crotch and anus...