It is the year 2017, and Europe is being invaded by the forces of the Holy Britannian Empire. In an attempt to combat the opposition's overwhelming pressure and put an end to the massive casualties, the army forms a special unit called Wyvern, or W-0, composed of former Japanese citizens referred to as Elevens. Recruited from ghettos, these young men and women pilot Knightmare frames—humanoid war machines—into dangerous operations where death awaits, hoping to make a name for themselves. When a European regiment attempting to recapture a crucial city is pinned down by the enemy, it's up to W-0 to bail them out. Among those selected for the rescue operation is Lieutenant Akito Hyuuga, known as Hannibal's Ghost due to his prowess on the battlefield. However, the supposed rescue mission becomes suicidal when, in an attempt to take out as many Britannians as possible, the commanding officer initiates the Knightmare's self-destruct sequence. In its aftermath, Akito finds that he is the last one standing…

Since the demise of the man believed to be Britannia's most wicked emperor one year ago, the world has enjoyed an unprecedented peace under the guidance of the United Federation of Nations. However, this fragile calm is shattered when armed militants successfully kidnap former princess Nunnally vi Britannia and Suzaku Kururugi, the chief advisor of the Black Knights, sparking an international crisis. The powerful and untrustworthy Kingdom of Zilkhstan is accused of orchestrating their capture. To investigate, world authorities send Kallen Stadtfeld and her associates on a covert operation into the country. There, they encounter the immortal witch C.C., who is on a mission to complete the resurrection of the man responsible for the greatest revolution in history—a legend who will rise up, take command, and save the world from peril once again.

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, in this thrilling conclusion to the series.

Having achieved miraculous victories in a series of battles against the Britannian Army, Lelouch Lamperouge has brought the Black Knights, his paramilitary organization, to a more powerful state than ever before. Nothing seems impossible for him when he utilizes his military strength, intellect, and Geass power of absolute obedience. However, obstacles in the face of the uprising never cease, putting Lelouch in a difficult predicament. Most worryingly, Suzaku Kururugi's combat prowess and the appearance of a mysterious child named V.V. threaten to put an end to Lelouch's great rebellion.