Code Geass: Lelouch of the Rebellion (2006)

S2E1 The Day a Demon Awakens

A year has passed since the Black Rebellion, and Lelouch Lamperouge seems to have forgotten everything, living peacefully as a student. When he skips gym class, he heads to Babel Tower with Rolo for a day of gambling. Meanwhile, C.C. guides the Black Knights in a raid on the tower to reclaim their lost leader. During the chaos, C.C. restores Lelouch’s memories, and he once again dons the mask of Zero. In response, Suzaku Kururugi vows to the Emperor that he will be the one to kill Zero with his own hands.