2010 , superpower British Empire, Britannia in order to win Japan 's underground resources aggression Japan powerful weapons the British Empire Knightmare offensive , the Japanese conquered in less than a month . Japan was deprived of liberty, rights , and even the name of the country , the British Empire " Japan " renamed as " Area 11 " , the term "Japanese" were 11 to replace . On the surface it seems the rule of the British Empire seems to be unbreakable, but had cracks .
Seven years later in 2017 , the Geass power of the edge of death , determined to smash the British Empire, the Black Prince Lu Lu repair , and the seventh generation to generation humanoid mechs Lancelot , determined to reform from within the Empire white Knight hinge wood Suzaku , affected the entire world .