When war breaks out in Europa, the small nation of Gallia is targeted by the East Europa Imperial Alliance for its large reserves of Ragnite. Despite the superior industrial and military capabilities of the Empire, Gallian citizens take up arms to fight off the coming invasion. Welkin Gunther and Alicia Melchiott are two such citizens, whose hometown of Bruhl was an early casualty of the war. As Welkin secures a series of victories for Gallia, the Empire turns to more and more drastic means to defeat him, eventually seeking out the power of a legendary race of superhumans known as the Valkyrur.