After a generation of warfare, the Gundam boys finally brought peace between Earth and the colonies by helping to defeat the Oz and White Fang armies. Now, out of the rubble, the surviving soldiers are re-emerging and clustering together into new factions.

Heero Yuy has become a vigilante pacifist, tracking down weapons stashes and destroying them, while Relena, former Queen of the Earth Sphere, tries to maintain the peace politically. But an unmanned weapons factory has been discovered somewhere near Mars, and now the Gundam boys are going to have to dust off their mechs for one more battle if peace stands a chance at lasting.

This story line falls between the end of the regular series and the Endless Waltz story arch.