Code Geass: Lelouch of the Re;surrection

Five years after the events of the Zero Requiem, the peace that LELOUCH VI BRITANNIA sacrificed his life for is shattered by a secret dark order that has the goal of reducing the world to a permanent state of chaos and violence. Natural disasters spread around the world like wildfire, reducing the strength of many world governments to pathetic levels, they turn to ZERO, a disguised SUZAKU KURURIGI, and THE BLACK KNIGHTS to save them from this threat.
But there is more to this threat than meets the eye, will ZERO and THE BLACK KNIGHTS be enough to save the world, or will they need to turn to the help from the former DEMON EMPEROR, LELOUCH VI BRITANNIA?

(This story takes place in the shows original timeline [R1 and R2], it should be noted that maximum enjoyment of this story can be reached if the reader has already previously seen both seasons of the original anime).