The Republic of San Magnolia has been fighting the Empire of Giad for nine years, initially suffering heavy losses due to the Empire's autonomous mechanized Legions. The Republic has since developed its own autonomous units, called Juggernauts, which are remotely controlled by Handlers. However, these Juggernauts are actually piloted by humans known as "86," a term used to refer to the Colorata minority in San Magnolia. Despite having equal rights in the past, the Colorata were forcibly segregated and subjected to discriminatory treatment, with many being forced to fight in the war to gain better living conditions.