Kunoichi Rui is a dropout in the ninja village. She couldn't keep up with the training and ended up doing odd jobs. Frustrated, Rui trained herself and gained skills. One day, Rui asked a jonin to train her in swordsmanship. At first, the jonin reluctantly accepted her, but was surprised by her skills. Although Tono acknowledged her swordsmanship skills, he said that a kunoichi is useless unless she can use sexual techniques. Rui said, "I'll endure any training," and from that day on, sexual training began. Rui's whole body was smeared with a secret medicine, and potato stalks were twisted into her crotch and anus...