WARNING︰THIS ARTICLE CONTAINS MATERIAL WHICH MAY OFFEND AND MAY NOT BE DISTRIBUTED , CIRCULATED , SOLD, HIRED , GIVEN , LENT , SHOWN , PLAYED OR PROJECTED TO A PERSON UNDER THE AGE OF 18 YEARS.
At a time when nations are warring, a sword with mysterious power called "Heaven's Sword" is stolen. The sword gives the bearer the power to conquer the world! Rantaro attends the Ninja Academy where he hopes to become an elite ninja. He and his classmates are assigned to retrieve the stolen sword, their first real ninja mission.