The U.E. attack of Nora has left the colony in imminent collapse. The Federation commander of the colony, Hendrick Bruzar, came up with a plan to use the flagship battleship, Diva, to save the colony core, thereby enabling the colony inhabitants to escape the destruction. However, the captain of the Diva has other plans. Meanwhile, Flit tries to escape the colony while piloting the Gundam, but comes upon a stranded girl named Yurin, who seems to have mysterious powers of her own.

Diva was preparing to pull Nora's Core when two new UE approached them so Grudeck decided to confront them first before resuming the operation. The new UEs proved to be a formidable opponent to Flit who started losing his temper but Yurin calmed him down while helping him come up with a plan to effectively take down their opponent. One of the two UEs entered Nora and attacked the control base where Bruzar was located, badly injuring him in the process. Flit is fighting the remaining UE to distract him away from Diva, but when the DOTS rifle's ammo was depleted he stopped the UE by shielding the Gundam in front of Nora and told the UE that he won't let the citizens harmed. To his surprise the UE left.

The Diva arrives at the neutral space colony Minsry, where Captain Grodek Ainoa attends conference devise a strategy to fight the UE. Flit attends the meeting as well, where meets young girl Yurin once more. While attending the conference, Federation Forces move in to arrest the Captain on the charge of mutiny.

The command crew of the Diva's escapes Federation Commander Stroller Guavaran and his forces on the neutral space colony Minsry, reboards the ship. However, as the Diva departs, Commander Guavaran's task force of warships appears and traps the Diva in second attempt to capture the mutinying Captain.

Decil duels with Flit again and calls in his secret weapon, Flit's capture friend Yurin L'Ciel. She is forced by Decil to fight Flit as simply tool to defeat him. In course of the duel, she is killed by Decil, which enrages Flit. Using his X-Rounder abilities, Flit soon disables Decil's Mobile Suit and leaves him drift in space. However Flit is emotionally distraught from Yuril's death, making him feel emotionless. Flit is soon called by Diva to lead the way the pave into the Fortress's drydock. Flit with reckless abandon, he forces his way into the Fortress. His efforts allowes the Diva to dock and embark its ground forces into it. Flit returns to the Diva and quickly refits the Gundam to AGE-1 Normal configuration, then accompanies the boarding crew while not replying to anyone communications.

The siege of the Space Fortress La Gramis grinds into its final stages, and despite the tremendous losses to both the Vagan and Federation sides, the atrocities of war only seem to be on the increase. As the long struggle reaches its end, can Flit, Asemu and Kio reach any kind of agreement with Ezelcant?