After a space colony asserted its independence from the Earth Federation, the 7th Space War ensued: a brutal conflict between Earth and space. The Federation retaliated with mobile suits, called Gundams, against the Space Revolutionary Army. However, the Space Revolutionary forces executed their ultimate move and sent hundreds of space colonies crashing down onto the Earth, causing a seven-year-long nuclear winter. The Federation crumbled, but the Space Revolutionary Army couldn't penetrate the Earth after the colony drop. Now, fifteen years have elapsed, and it's After War 0015. A New Federation has materialized on Earth to restore order, while the colonial leaders have been reconstructing their own forces in space. By chance, a fifteen-year-old boy named Garrod Ran stumbles upon an old Federation mobile suit, the Gundam X. He uses it to aid the Vulture ship Freeden in its struggle to prevent a recurrence of the past's blunders.