During Celestial Being's intervention in Moralia, Setsuna has been reunited with a figure from his past. His opponent is the mercenary soldier Ali al-Saachez.

At a testing ground, the AEU is demonstrating its new Enact mobile suit. Suddenly, a white mobile suit descends from the sky and swiftly destroys the Enact. This intruder is the Gundam Exia, and this marks the start of Celestial Being's first mission.

The Union ace pilot Graham Aker confronts Setsuna as he leaves Ceylon. In Tokyo, the news reporter Kinue Crossroad begins her own investigation.

As the world reacts with confusion to Celestial Being's announcement, the Gundam Meisters prepare for a second mission which will clarify their intentions.

The Human Reform League holds a memorial service for the soldiers whose lives were lost in the recent interventions, and reaffirms its opposition to Celestial Being.

Celestial Being's activities have reduced the level of conflict in the world, but there are some who do not welcome this change.

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.

Princess Marina leaves Azadistan and begins a worldwide diplomatic tour to seek help for her impoverished nation.

An international terror network has begun a campaign of bombing attacks in order to force Celestial Being to halt its armed interventions.

The three superpower blocs begin planning a massive joint military exercise which will serve as a challenge to Celestial Being.

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.

Four months have now passed since Celestial Being began its armed interventions. The initial chaos has subsided, and life goes on.

The A-LAWS have abruptly retreated after receiving word of a coup d'etat within the Federation. Hoping to reunite with his comrades, Setsuna sets the 00 on a course for Africa.

The year is 2312 A.D, five years after the first appearance of Celestial Being, and four years after the organization was destroyed by the United Nations forces.

Setsuna and his comrades have successfully overpowered the A-LAWS and freed Allelujah and Marina from the Federation's detention center. When Marina asks them to return her to Azadistan, they set a course back to the Middle East.

Although Princess Marina has secured assistance from the United Nations for her troubled homeland, the Kingdom of Azadistan is still in turmoil.

With the reappearance of Celestial Being, the A-LAWS begin gathering personnel who have experience fighting the Gundams.

Four months have passed since the "Break Pillar" incident, the near-collapse of an orbital elevator. The A-LAWS leaders receive word that Celestial Being has resumed activity after months of silence.

In the aftermath of the orbital battle, the Human Reform League's scientists realize that one of the Gundam Meisters is actually a former test subject of their own Superhuman Institute.

The Ptolemaios 2, damaged by the Innovators' attack, descends to Earth. Now separated from his comrades, Setsuna searches for the Ptolemaios 2. But instead, he finds Ali al-Saachez and his Arche Gundam waiting for him.

As Saji Crossroad searches for Louise Halevy amid the chaos of battle, Soma Peries hunts for Andrei Smirnov in order to avenge Sergei's death. Setsuna confronts the Innovator Hiling Care and unleashes the power of the Twin Drive.

The Innovator Revive Revival is now a prisoner aboard the Ptolemaios 2, but he sneers at the questions of its crew, and gives them nothing but evasive replies. Suddenly, the crew receive word that crewmember Mileina Vashti has been taken hostage.

In Earth orbit, Sergei's mobile suit team continues its attack on the Ptolemaios and the Gundam Meisters. While Setsuna and Lockon defend their mothership, Allelujah and Tieria find themselves caught in the enemy's trap.

Setsuna's actions have prevented a coup d'etat in the Kingdom of Azadistan, but the conservative leader Massoud Rachmadi remains missing, and the situation continues to worsen.

The Union, Human Reform League, and AEU begin their joint military exercise in the Taklamakan Desert.