Japan has been invaded and conquered by the Britannian Empire. Japan is now known as Area 11 and its citizens known as Elevens. The Britannian Empire takes away Japan's autonomous power and imposes its rule through the use of Knightmares. The Empire's rule has never faltered, but cracks have begun to show...
After the failed Black Rebellion uprising against the Holy Britannian Empire, the Black Knights resistance group is powerless without their leader Zero. Lelouch, who lost his memory of his past as Zero, is living a peaceful life as a high school student. C.C. attempts to jog his memory and convinces him to become Zero again to complete their mission.