In G Gundam, the ruling elites leave Earth for space colonies in the first year of Future Century. Two years after the migration, a full-scale war develops on Earth as each nation fought to gain control. The colonies formed the United Colonies Federation and regains control of the nations on Earth. The United Colonies Federation decides to end the conflict on Earth by holding a tournament called Gundam Fight every four years. The nation represented by the winning Gundam earns the right to lead Earth and the colonies for the next four years.