Mobile Suit Gundam U.C.0096: Rising Sun

Set 3 years after the events of Char's Counterattack, a young man is caught in a deadly conflict between the Earth Federation and Terrorist Organization "The Sleeved" as they battle for an object that is said to have changed the course of Human history. The title page of the first chapter announces "A new story different from the anime and novelization is born!"

Mobile Suit Gundam U.C. 0094: Across The Sky is a manga illustrated by Katsumoku, and officially launched in the December issue of magazine series Gundam Ace. (Source: Gundam Wikia)