"Can you become my teacher?" After the case occurred in 2116 in the Southeast Asian Union, the SEAUn, Kougami Shinya kept on wandering. In a small country in South Asia, Kougami rescues a bus carrying refugees that were being attacked by armed guerrillas. Among them, there is a girl named Tenzing. Tenzing begs Kougami to teach her how to fight to take revenge. What is the aspect of this world that a girl who seeks for revenge and a man who could accomplish his revenge can see at the margin of a world without a way out…?