 In the episode "Four Months Later...", Hiro learns that Kensei did not discover the sword encased in ice, as the legend told.Instead, the sword was created by a swordsmith in the town of Otsu, and given to Kensei by the man's daughter in order to protect the town from bandits.When Kensei failed to keep his side of the bargain, the swordsmith's daughter took back the sword.