Code Geass - The Nightmare of Nunnally

I just spent the past few days reading all of the Code Geass manga. I don't know why. I just felt like doing it. Today I finished The Nightmare of Nunnally, which is among the most confusing things I've ever read. I'm not entirely sure what just happened. Lots of little details didn't fit, either. Apparently Lelouch can sprout wings? When did that happen? I don't know...not a fan so much. It was sort of messy and extremely difficult to follow.

What is this? I don't know.