In the year Future Century 0060, the former nations that once covered Earth"s surface now function as independent colonies drifting in space. Their original planet has become uninhabitable, and the authority over all colonies is decided by unanimous participation in the intergalactic Gundam Fight Tournament—a series of contests where each colony"s champion battles to prove who is best suited to rule.
The representative of Neo‑Japan is Domon Kasshu, a man who embraces the position for personal reasons. Domon hunts across the galaxy for his brother, a criminal accused of killing their mother and stealing the Devil Gundam, an advanced weapon capable of catastrophic destruction. While seeking justice for his sibling, Domon journeys from colony to colony, encountering fighters who will later become allies or adversaries in the upcoming Gundam Fight Tournament.
With the power of the Shining Gundam at his side, Domon fights to uncover the secrets of his painful past, enduring betrayal and severe setbacks on his path toward individual and national victory.