One year has passed since the Black Rebellion, a failed uprising against the Holy Britannian Empire led by the masked vigilante Zero, who is now missing. At a loss without their revolutionary leader, Area 11's resistance group—the Black Knights—find themselves too powerless to combat the brutality inflicted upon the Elevens by Britannia, which has increased significantly in order to crush any hope of a future revolt.

Lelouch Lamperouge, having lost all memory of his double life, is living peacefully alongside his friends as a high school student at Ashford Academy. His former partner C.C., unable to accept this turn of events, takes it upon herself to remind him of his past purpose, hoping that the mastermind Zero will rise once again to finish what he started.

Code Geass: Hangyaku no Lelouch R2 is an original anime series by Sunrise animation studio with original character designs by the all-female Japanese manga artist group CLAMP. Manga and light novels based off the show have been published by Kadokawa Shoten. The show has sold millions of DVDs and Blu-ray volumes and is extremely popular in both Japan and North America. The show is known for its multi-genre appeal and for its diverse cast of characters who face many moral dilemmas over the course of the series.

The series won: "The Best TV Animation" award at the thirteenth Animation Kobe event in 2008, and "The Most Popular Anime" award at the Animage 's 30th Annual Anime Grand Prix.