The story follows the life of Retsuya and Gouki, two brothers with the same objective as Go and Retsu, to race and win championships! The two new brothers are faced with various traps set by an evil organization...together, along with other friends, they try to enjoy their races as much as possible, showing off their competitive spirit and taking down any kind of evil that might put the sport they love so much at risk!

It is A.C. 196—one year after the conflict between Earth and its nearby space colonies ended with the formation of the Earth Sphere Unified Nation. As mankind enters a new era of unity and prosperity, four of the five Gundam pilots decide to follow in society's footsteps and disarm by launching their mobile suits into the sun. However, their plan is unexpectedly suspended when a rebellion erupts with the emergence of Mariemaia Khushrenada—who claims to be the child of fallen dictator Treize and desires to conquer the world in his stead. Deciding that they are the last line of defense for the Earth Sphere, Heero Yuy, Trowa Barton, Duo Maxwell, and Quatre Raberba Winner scramble to retrieve their Gundams and fight to protect the peace the people of the colonies have pursued for so long. Despite their unwavering resolve to complete one final mission, the battle will be challenging: the pilots' former ally Wufei Chang has pledged his allegiance to Mariemaia's cause instead.

A dispute between young band members and an unfortunate choice of melody inadverdently draws them all into the demonic horror known as the desert-god Gandalla.

In the late Universal Century, the Earth Federation enacts an attempt to propel a craft at faster-than-light speeds. Zeon forces attack the launch facility in space and destroy it, but not before the craft can be successfully deployed.