Edo Era, the world of the Tokugawa Shogunate. There were those who crept in the darkness. The Hiruko Ninja. They are fated to live in darkness, and die in darkness. However, if the power of the Dragon’s Jewel, which has been handed down among the Hiruko since ancient times, is combined with that of the Priestess of Light, even the Hiruko can be bathed in light. There was one who, believing this, ran away from the Hiruko. And thus begins our story.