Code Geass
In an alternate timeline, the Holy Empire of Britannia has conquered Japan, stripping its citizens of freedom and renaming the nation Area 11. Lelouch Lamperouge, an exiled Britannian prince, acquires a mysterious power called "Geass" that commands absolute obedience. Using this power, he adopts the masked persona "Zero" to lead a brutal rebellion against the empire to avenge his mother and protect his sister.