Zeon Zum Deikun dies in the middle of an independence movement speech; in the fallout, Degwin Sodo Zabi continues to maneuver to seize control of Side 3 as Deikun's orphaned children face troubling destinies.

Three years after their escape to Earth, Casval and Artesia are once again targeted by the Zabi family; Side 3 is renamed the Autonomous Republic of Zeon, where development of a new weapon begins.

Casval enrolls in the Zeon's Space Defense Military Academy using the false identity of Char Aznable; he develops a friendship with his classmate Garma, a Zabi heir.

After the Dawn Rebellion, Char moves to Earth and meets a mysterious girl named Lalah Sune; meanwhile, Amuro's father, Tem Ray, is working on the Gundam development project.

The Zeon ace Char Aznable, driven by revenge, goes into action as the Battle of Loum finally begins.

The outnumbered Zeon forces at Loum hatch a secret plan in their battle with the Earth Federation.