Shinya Kougami keeps getting lost in the Southeast Asian Union (SEAUn), out of the Sibyl System's sight in Japan. Kougami comes upon Guillermo Garcia, leader of a paramilitary force trying to bring peace to the war-torn country, while passing through the Tibet-Himalayan Alliance Kingdom. Kougami declines to join Garcia's cause out of concern over joining yet another mercenary organization, but agrees to be transported to the adjacent Tibetan capital by one of Garcia's men. Kougami's intention to avoid becoming involved is jeopardized when armed rebels ambush a bus full of migrants. Tenzing Wangchuck, a young woman who is half Tibetan and half Japanese, is one of them. Wangchuck asks Kougami to teach her how to fight after being impressed by his fighting skills as he defeats the attackers by himself She has the ability to exact retribution on the warlord who killed her family. Kougami is initially hesitant to comply with her request since he is personally aware that once you take a human life, there is no going back to the person you were. Will he train her in the face of the girl's yearning for vengeance, which echoes the menacing chasm within his own heart?