Feudal Japan: Amidst the absolute rule of the Shogun, one man, Shuranosuke Sakaki the master swordsman, furiously protected his independence. Bearing the legendary blade Onimaru he walks alone and unafraid, cutting a swathe through those who stand in his way. Hired by the Tokugawa Shogunate to rescue Princess Mayu from the clutches of a group of bandit ninjas - the Seki Ninja, Shuranosuke must rely upon all his skills as well as the aid of the beautiful ninja thief Orin to stand against the summoned undead spirits of Hell.