The Holy Empire of Britannia has conquered Japan and renamed it Area 11, its citizens renamed Elevens. Turned into poor servants for the ruling Britannian elite, the Elevens begin to form rebel factions. Lelouch, a young prince of Britannia, craves revenge for the death of his mother and the blinding of his sister and vows to bring down the tyranny rule from within. While living in Area 11 a mysterious girl named C.C. gives him the power of the Geass. With his newfound power Lelouch takes on the humanoid fighting robots, the Knightmare Frames, enlisting other Elevens in his battle again Britannia.