Fukui also wrote a prequel novel, which was bundled with the PlayStation 3 game's Special Edition released on March 8, 2012. Mobile Suit Gundam Unicorn - The Postwar War (機動戦士ガンダムUC(ユニコーン) 戦後の戦争 Kidō Senshi Gandamu Yunikōn Sengo no Sensō) contains an all-new story set two years before the events of the first episode. It deals with Full Frontal's origins and how the Neo Zeon stole the Sinanju. Mobile Suit Gundam Unicorn - Phoenix Hunting (機動戦士ガンダムUC(ユニコーン) 不死鳥狩り Kidō Senshi Gandamu Yunikōn Fushichō kari) was originally included with Mobile Suit Gundam Unicorn GREAT WORKS III episode 7, a collection of storyboards, artworks and interviews released on June 23, 2015, and revolved around Operation Phoenix Hunting, a top secret mission carried out by a Federation garrison just before the last battle between the Nahel Argama and the Neo Zeon forces.
Both books were compiled into the 11th volume, released in March 26, 2016, the first of a series of short stories that take place around that point of the Universal Century.