In the world of the Ninja, skills as a fighter play only a small role in determining one's rank among the order of Shinobi. Kageru is from the village of Shiroyama. He is strong, fast and extremely intelligent - the best in his class. But therein lies the problem, for Kageru's birth predestines him to the lower class of Shinobi. His friend Aoi finds herself in the same situation, and together they will be forced to question not only themselves, but also some of the most sacred edicts of the Shinobi hierarchy. They must choose between their mission and their lives, and between their destinies and the Law of Shinobi. Kagerou and Aoi soon become fugitives, pursued by the Shinobi of Shiroyama, and assassins hailing from all the families of Iga. The chase is on. Kagerou and Aoi are left to search for both the sincerity of their allegiances as well as asylum from their hunters. Such are their lives as Runaways.