The last person to ever challenge Yagyu Jubei was Ryujoji Daigo from the rival school Ryujoji-Shinkage. Their school was on the brink of extinction and wanted revenge on the Yagyu's. However, Daigo failed in his attempt, and shortly after that, Jubei died. Thus, the Ryujoji's desire for revenge was unfulfilled and would remain that way until Jubei reappears in a successor. For the 300 years since then, the Ryojoji-Shinkage sword school has existed in secret so that when Yagyu Jubei reappears, they can take their revenge and a Ryojoji will be the greatest swordsman.