Code Geass: Kallen of the Atonement

The death of the 99th Emperor in the battle of Mt. Fuji was a turning point in the history of the world. For his killer, the Ace of the Black Knights, it was when the foundations of her beliefs crumbled to dust around her. But the fire in Kallen's heart is not so easily extinguished. She ventures into the past to ensure the survival of Lelouch vi Britannia… by any means necessary.