A mysterious benefactor has provided the three superpower blocs with a new weapon against the Gundams. Quickly establishing a military alliance, the superpowers organize an elite fighting force under the aegis of the United Nations. As a result of Celestial Being’s actions and the misdeeds of Team Trinity, the nations of the world are now unifying to defeat the Gundams.

Kinue Crossroad, in her ongoing investigation into Celestial Being, has discovered that Team Trinity reports to the linear train corporation president Laguna Harvey. Even as her attempts to interview Harvey lead Kinue into unexpected danger, other players are making their own moves against Celestial Being.

Having determined that Team Trinity itself is promoting conflict, Setsuna confronts the Gundam Thrones. Tieria comes to his assistance, and the two Gundam Meisters fight as a team for the first time. Tieria detaches the Virtue’s outer armor to reveal the Gundam Nadleeh and activates its unique Trial System, which allows him to take control of any machine linked to Veda. But the attempt backfires, confirming that Veda itself has been compromised by Team Trinity and its allies. Johann Trinity orders his siblings to depart, leaving Setsuna’s comrades with a shocking piece of information.

At a hospital in Spain, Saji Crossroad parts ways with Louise Halevy, who has lost her entire family and suffered severe injuries in an unprovoked attack by one of the new Gundams. Louise asks Saji to return to school and fulfill his dream of working in space.

Team Trinity continues its campaign of armed intervention. Unlike Setsuna and his comrades, they are targeting military facilities of all kinds and exterminating everyone on the scene, even civilians. The world’s leaders are horrified by their actions, and the three superpower blocs wonder if even their combined strength would be enough to defeat the Gundams.

The other members of Celestial Being continue their investigation of the mysterious Team Trinity. The Ptolemaios crew discover that the Gundam Thrones are powered by pseudo solar reactors, apparently based on technology stolen from Veda, Celestial Being’s master computer. As word arrives of Team Trinity’s latest atrocities, Setsuna decides to respond.

The Ptolemaios crew return to space for a rendezvous with Team Trinity. When they finally meet the new Gundam Meisters face to face, Setsuna and his comrades are disturbed by their attitude and behavior. Nena flirts with Setsuna, Michael treats the original Meisters with hostility and contempt, and Johann refuses to answer any of their questions, saying only that they share the same goal of eliminating war.

After this awkward meeting, Team Trinity depart the Ptolemaios and begin their own campaign of armed intervention. Their first target is the Union military base that serves as the headquarters of Graham Aker and his Over Flags team, and they destroy it without mercy. Meanwhile, Saji Crossroad bids farewell to Louis Halevy, who is returning to Spain to attend a family wedding.

On the brink of defeat, the Gundam Meisters have been rescued by the intervention of Celestial Being’s second team. Their rescuers identify themselves as Johann, Michael, and Nena Trinity, the Meisters of the mysterious Gundam Thrones. But who are these new allies, and why was their existence previously unknown to the Ptolemaios crew? And what is the significance of the red GN particles emitted by the Gundam Thrones?

United Nations ambassador Alejandro Corner calls a meeting of his fellow Observers, the secret society that wields a veto over the actions of Celestial Being. Although they have no record of the second team’s existence, after reviewing the results of Celestial Being’s previous armed interventions, the Observers decide to acknowledge Team Trinity as allies.