Nightmare of Nunnally, Volume 1

This series follows a different reality of the world of Code Geass. It follows Nunnally, Lelouch's sister. Lelouch is still prominent player, but several characters are pushed to the back not playing much of a role in the story, such as most of the Black Knights, the Chinese Empire, Knights of the Round, or the students of Ashford Academy. The story is oddly, lolicon in the first book, but that is dropped by the second book, thankfully, to give way to a great story. Nunnally, gains her own Geass power, the power of Bismark in the original series.