He was the child of the Musha Hyaku Shiki and Qubeley. As the world became more peaceful, Hyaku Shiki and his family created the ninja village of Genbu in the mountains, far from civilization, and Hyaku Shiki Kai was raised there. He received intensive training from his father and uncle Hyakkimaru from an early age, and became so overwhelmingly strong that he won the martial arts tournament in Genbu, leaving no one to chance, and his father sent him to train under Mark Two in the jungle. He struggled to master his dual-sword style due to his brute strength, but while desperately trying to save animals from a forest fire, he mastered the essence of dual-sword style and was chosen as the "Ball of Venus".