From the wikia: "Set two years after the events of Valkyria Chronicles, the story revolves around a civil war within the small Europan nation of Gallia. A rebel group made up of dissatisfied aristocrats and like-minded soldiers and citizens calling themselves the Gallian Revolutionary Army rises up in arms in order to wage an ethnic cleansing campaign against Gallians of Darcsen descent. However, with the intense fight against the Empire having left Gallia's regular army in an exhausted state, there is initially little to stop the insurrection from gaining momentum. Laws preventing the formation of a national militia to fight fellow Gallians force the government to deploy military academy cadets to the front lines in order to combat and defeat the GRA forces."