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...

Source: ANN

The Britannian youth, Lelouch, received a special power from a mysterious girl. GEASS. An absolute power which allows the user to give orders to anyone. Lelouch decided to plan the destruction of the Britannian Empire by using this as a weapon. His goals are to take revenge for his mother, and to create a world in which his little sister, Nunnally, could live in peace. All while knowing that what lies ahead is his father, the Emperor of Britannia.

Note: episodes 24 and 25 were pre-aired a special in-person premiere airing event in Osaka on July 21, 2007, and in Tokyo on July 22, 2007. The regular TV broadcast started on July 29, 2007.

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Summary: Code Geass: Hangyaku no Lelouch Special Edition - Black Rebellion
Sequel: Code Geass: Boukoku no Akito
Alternative setting: Code Geass: Hangyaku no Lelouch - Nunnally in Wonderland
Alternative version: Gekijou Soushuuhen Code Geass: Hangyaku no Lelouch
Other: Code Geass: Dakkan no Roze