NoN vol. 5, the final volume will release on 25th April. Last chapter (Last Code, Code 26) was just released.
I just finished browsing the chapter and I thought Lelouch and Nunnally's part is rather interesting.
Spoiler for Possibility of Parallel Worlds:
In NoN's world, LotR is just one of the infinite possible world based on Nunnally's conversation with Lelouch. Snippets of LotR major events were featured a bit in NoN such as Euphie's, massacre, Suzaku's rage during the Mexican standoff and Lelouch's death. Nunnally made her choice for this world she is in (NoN world) and she is confident for a gentle world. Lelouch had a different opinion. It seems that he is pessimistic about this world. But Nunnally is firm with her choice to reject her parents' plan although Lelouch seems to be able to accept it in this world. In the end, he respected her choice and disappears from this world.
Lelouch is looking hot with both white and black wings
Before Lelouch disappears (A pair of black and white wings spouted on his back
) hugs Nunnally. He wanted her to remember that no matter where they are and who they are, her brother Lelouch will always love his sister, Nunnally (No matter which world they are in, Lelouch will always love Nunnally).
Vol. 5 will cover Rolo VS Alice, Nunnally's confrontation with her parents, the truth behind's Marianne's death, Nunnally's choice for the world, and the final chapter.