"Code Geass: Lelouch of the Rebellion" is an anime series set in an alternate history where the Holy Britannian Empire has conquered Japan. The story follows Lelouch Lamperouge, a former prince who gains the power of Geass, allowing him to command anyone to obey his orders. He uses this ability to lead a rebellion against Britannia, seeking to create a better world for his sister, Nunnally. The series explores themes of power, morality, and the consequences of rebellion. As Lelouch adopts the persona of Zero, he faces various challenges, including battles with other factions and the complexities of his relationships with friends and enemies alike.