Kou, his friend Chuck Keith, and veterans South Burning and Dick Allen follow Gato through the outback in an attempt to recapture the Physalis. Zeon forces ambush them and kill Allen as Gato awaits a Komusai shuttle for extraction. Kou destroys the shuttle but it is actually a diversion - Gato escapes on a submarine that provided covering fire during the Torrington base attack.

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.

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.