Kidou Senshi Gundam U.C.0094: Across the Sky  

Mobile Suit Gundam U.C.0094: Across the Sky, 機動戦士ガンダム U.C.0094 アクロス・ザ・スカイ

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)