A young samurai, in search of a new katana, enters a blacksmith's shop. There, he stumbles upon three warriors threatening the elderly craftsman, determined to seize a legendary sword once wielded by Japan's greatest samurai. After calling them out, he catches the attention of their leader, who sets a trap by proposing a three-against-one duel. Against all odds, the young samurai accepts, ready to defend the honor of the blacksmith and the legacy of this mythical blade.