Guarda su Altadefinizione. The Ninja world is set ablaze when the mystical "Spirit Sword" is stolen by the Black Ninja Cal, giving its possessor the ultimate power of destruction. When the leades of the five most powerful clans are murdered, the hunt to track down and retrieve the sword is on. A titanic battle begins between all six clans, demonstrating all the skills of the ancient techniques. Hong Kong cut and paste edit of the 1981 Taiwanese Film "飛越補習班" (Kuo-Hao Crams for College) with new ninja scenes.