A few days out of Von Braun, Burning continues to train Kou and Keith, who later eggs him to try giving Nina a chance. Keith also earns Mora's ire for showing him Monsha's private collection of Nina pictures. A resupply rendezvous by a Federation ship is cut short as the Albion detects the Federation flagship Birmingham, with General Green Wyatt aboard - meeting with Cima. In the midst of the ensuing battle, Burning retrieves a briefcase that contains files for something called "Operation Stardust" and talks with Kou about them. However, a minor hit on Burning's GM Custom during the battle turns fatal, as the mobile suit careens out of control and explodes. Uraki is promoted to junior lieutenant as the crew mourns Burning's death.

Kou and Keith continue to fight Zeon forces while on patrol near Konpeitoh (Solomon). As Delaz welcomes the Axis Advance Fleet into the Earth Sphere, Gato prepares for his own part of an attack on Konpeitoh, which is hosting the Naval Review. The Delaz Fleet keeps probing the Federation defenses, keeping Kou occupied. A defense satellite detects Gato breaking through another sector and Uraki is ordered to intercept him before he crashes the Review. He fails to get to Gato in time, as the Zeon pilot fires the GP02's MK82 nuclear bazooka at the Federation fleet with the Birmingham in the center of his sights.

The Albion arrives at Anaheim Electronics' La Vie En Rose research ship to get the GP03 Dendrobium Stamen, where they are met by designer Lucette Auduvie and Federation officer Nakaha Nakato. Almost immediately, Nakato tells the crew that the GDP has been suspended and they are all confined to the Albion until further notice. Lucette shows Kou the GP03's diagrams and later sacrifices her life to stop Nakato killing Kou as he takes over the GP03 with the Albion crew's help and leave La Vie En Rose. Meanwhile, the Federation command expresses indifference at the upcoming Zeon colony drop on the Moon. The Konpeitoh survivors mobilize and try to stop it, but run out of fuel when Cima maneuvers to have Von Braun City's laser station activate the colony's engines to redirect it toward Earth. Gato also meets up with the Axis Advance Fleet, where he gets the massive Neue Ziel mobile armor and tries it against a small Federation patrol.

Kou and Gato, now in their mobile armors, finally take each other on as the Albion crew tries to stop the colony before it passes the minimum limit for terminal entry. Cima's crew takes Delaz hostage aboard his flagship, the Gwaden. At Jaburo, General Kowen desperately tries to convince EFSF supreme commander Gen Gene Collini of mobilizing the military's full might to stop the colony, but Jamitov Hymen has Kowen taken away. Delaz discovers that the Federation has deployed the Solar System II mirror array past the terminal entry point and encourages Gato to see the operation through - before Cima kills him. Out of rage, Gato drives one of the Neue Ziel's claws at the Gwaden bridge.

The battle to stop the colony goes full-blast, with the Federation and Cima's forces working together to protect the Solar System II on one hand and the Delaz fleet shepherding the colony on the other while the Axis Advance Fleet stands back. Kou kills Cima in the fracas. The Solar System II fires, but Gato destroys the command ship, resulting in a weaker blast that barely damages the colony. As it breaks through the solar array, Gato enters the colony and inputs the final course corrections. Kou tries to stop him, but Nina interferes and protects Gato as they leave, revealing that they were once lovers. The two pilots continue to fight after Gato has Karius bring Nina to safety. The Solar System II remnants fire again, with many forces on both sides destroyed as the colony crashes into the Midwest. The Federation orders the Axis Advance Fleet to leave the Earth Sphere immediately, having overstayed their welcome, but Gato leads the Delaz Fleet survivors to attempt a breakthrough and dies in a kamikaze attack on a Federation ship. Several weeks later, Hymen and Bask Om announce the creation of the Titans. All records of Operation Stardust and the GP are erased, including Kou's one-year hard labor sentence. He eventually reunites with Nina, Keith, and Mora.