In a distant future where Earth lies uninhabitable, humanity's colonies wage for supremacy through the Gundam Fight Tournament. Neo-Japan's representative, Domon Kasshu, enters not just to win but to find his rogue brother, the alleged killer of their mother and the controller of the devastating Devil Gundam. His journey unveils allies and foes across colonies as he pilots the Shining Gundam, confronting his painful past and striving for justice and victory amidst deception and adversity.