After the assassination of Emperor Lelouch vi Britannia, his sister Nunnally vi Britannia and her bodyguard Suzaku Kururugi are being kidnapped by the attackers and held as prisoners in the Kingdom of Zilkhistan, lead by the siblings Shalio and Shamna. They plan to access the collective consciousness of Nunnally to restore the political might of their country since the world peace caused by the Zero Requiem has crippled their primary export, mercenary might.
Kallen Stadtfeld and the group attempt to ressurect Lelouch whose memories and personality are trapped in the collective unconsciousness. They bring back Lelouch who dons the mantle of Zero to rescue the prisoners. Zero force tracks the Nunnally and finds her in the Zilkhistan temple, where Zero kills Shamna and activates her Geass and travels back six hours in the past, allowing her to perfectly predict Lelouch's actions. After killing the sibling rulers, Lelouch once again backs away from the title of Zero and gives it to Suzaku, and departs on a journey and takes the alias L.L.