In the year Future Century 0060, the various countries that when comprised surface exist as separate colonies floating in space. Their home planet now uninhabitable, the ruler of all of the colonies is set by their unanimous participation within the intergalactic Gundam Fight Tournament a series of battles between the champions of every colony to work out who is most fit reign over all of them .
Neo-Japan’s champion is Domon Kasshu, a person who accepts the role with some ulterior motives. Domon searches the galaxy for his brother, a criminal who allegedly murdered their mother and made off with the Devil Gundam, a highly advanced weapon with the facility to unleash mass destruction across the galaxy. In his quest to bring his sibling to justice, Domon travels from colony to colony, meeting many of the fighters who will become his allies and enemies within the forthcoming Gundam Fight Tournament.