On a bright, peaceful day, siblings Nunnally and Lelouch Lamperouge take a moment to relax under a tree. When Nunnally asks him to tell her a story, Lelouch, who is unflinchingly resolute in doing his utmost for his sister, makes unique use of his Geass ability, breaking barriers to tell the most entertaining story he can.

Awakening alone under the tree, the previously blind Nunnally finds that she can see again and immediately spots a strange rabbit that resembles Anya Alstreim, the Knight of Six. The sight of this rabbit sends Nunnally falling down a hole, leading her to a colorful wonderland. Narrated by Lelouch himself, Code Geass: Hangyaku no Lelouch - Nunnally in Wonderland follows the lost Nunnally as she searches for a way back home, meeting a slew of colorful, familiar characters along the way.

The new side story is set in a.t.b.2017. A Knightmare unit made of boys and girls from Zone Eleven are thrown into a military operation with a 5% chance of survival. They must rescue an allied unit left behind on the European warfront.

Lelouch makes his final move; Zero Requiem takes action.

The Black Knights fight a close battle with Schneizel, neither side giving way. Before the F.L.E.I.J.A.'s can destroy them all, Lelouch must outsmart the brother he has never beaten and face the sister he has spent his life protecting.

Nunnally has declared Lelouch and Suzaku as her enemies. By siding with Schneizel she is allowing the use of the F.L.E.I.J.A., but she has been led to believe the destructive weapon would be used only when necessary. However, Schneizel has other plans

Lelouch has overtaken the empire, establishing himself as Emperor. He starts by abolishing the aristocracy and announcing Suzaku as the Knight of Zero. Lelouch announces that Britannia will join the U.F.N., but Schneizel makes an unexpected move.

Having trapped himself and his father, Lelouch finally demands the truth behind his mother's death. When Marianne herself appears, everything that Lelouch thought he knew crumbles around him. It's time to face the truth from the beginning.

Lelouch has lost everything and knows the only thing left is to take out his father, the Emperor. But he's not the only one bent on seeking him out. Suzaku, on Schneizel's orders, plans to assassinate the Emperor. What awaits the two on Kamine Island?

Nunnally is gone. Lelouch cannot deal with the grief, and as he locks himself away, Prince Schneizel calls a temporary ceasefire to reveal the truth behind Zero to his Black Knights. When they learn of his Geass, will this be the end of the Black Knights?

The battle for Tokyo fills the sky. The Black Knights take out the power gaining temporary advantage, but when Suzaku appears, he threatens to use Britannian's most terrifying weapon: the F.L.E.I.J.A. But to fire such a devastating weapon…is it worth it?

While the war rages on, Lelouch begs for Suzaku's help in making sure Nunnally will be safe. But with the death of Euphemia and Shirley still heavy in his heart, will Suzaku be able to do this for Zero, the murderer, or is it for Lelouch, his oldest friend?

The emperor is missing, and Zero takes the chance to ratify the United Federation of Nations. With the 47 nations involved, they will have enough backing to declare war on the Britannian Empire, finally freeing their countries. But nothing is ever so easy…

Finally, Lelouch comes face to face with his father. Everything he's planned and schemed has led to this confrontation. But when C.C. shows up, suddenly the truth about his contract and her past change everything he thought he understood.

With Shirley's death hanging over him, Lelouch directs his anger towards the Geass power. He makes his first contact with the mysterious V.V. and declares war. Meanwhile, Suzaku plans to take drastic measures to force answers about Lelouch out of Kallen.

Jeremiah seeks out Lelouch to end their dance once and for all. With his ability to cancel Lelouch's Geass power, Jeremiah may be more of a threat than expected. Or will an unexpected connection change their dynamic?

The Knights of Round have become students at Ashford Academy right as Lelouch has returned. But he has other worries, like the countless dates his stand-in set up while he was away. Lelouch must take on his next challenge—Cupid Day!

The Black Knights continue their fight against the Chinese, but the battle takes a turn for the worse when the Britannians back the Eunuchs. They no longer care about the empress' wellbeing, meaning Zero may have lost his bargaining chip…and the battle.

Zero absconds with the empress, taking her out of the Vermilion City. Before he can get far, they are stopped by an unknown Knightmare. The Chinese Federation gains the advantage, taking one of the Black Knights hostage. Can the Knights afford the loss?

A wedding is set to occur between the empress of the Chinese Federation and the first prince of Britannia. If the Chinese Federation turns on the Black Knights, everything they've work towards could come to an end. Will Zero dare to crash a royal wedding?

Zero agrees to join the Nippon special zone, much to the surprise of the Black Knights. He makes a deal with the Britannian army that will lead to his exile. But exile is the same as running away; has Zero forsaken the Japanese and his plans?

When Nunnally reveals her plans on starting the Nippon special zone again, Lelouch realizes that he may no longer be needed at her side. Has Zero's purpose been lost? Has the time come to drop the mask and stop his game?

Nunnally is set to be the new Viceroy of Area 11, and Lelouch will take every chance to get her back. But the reunion he wants may not go quite as planned. Has Nunnally chosen Suzaku over her beloved brother?

Suzaku returns to Ashford Academy to monitor Lelouch, determined to see if the other has regained his memories. Lelouch must take more care around the Britannian soldier. But when Suzaku plays an unexpected card, Lelouch's guard may fall to pieces.

Lelouch only has a short time to save the imprisoned Black Knights and regain his followers. But he also needs to figure out Rolo and his role in Britannian's game. Will this boy and his Geass keep Lelouch from bringing back the Black Knights?

Lelouch tries to get clues about Nunnally's whereabouts, but no one around him remembers her. To find her, he'll have to figure out his mysterious new brother, Rolo. But he'll have to do it while maintaining the guise that his memory hasn't returned.

With his memories back, Lelouch brings Zero to life once more. But there's a year's worth of work to rebuild and still many unknown variables. What new advantages will the Britannian army have against them, and is Zero up to the task to face them again?

It's a year after the battle between the Black Knights and the Britannian army. Zero is dead, and only a handful of Black Knights remain. But Lelouch is alive with no memory of the last year. Is it a trick or all part of a greater plan?