Mobile Fighter G Gundam

In the Year F.C. (Future Century) 60, most of humanity lives in space colonies orbiting the Earth. Every four years, a big tournament decides who controls the colonies, with each nation sending one representative to fight the others using a giant robot called a Gundam. Domon Kashuu is chosen to represent Neo-Japan in one of these tournaments, but he fights less to win for his nation than to find his brother, who has been blamed for the deaths of Domon's parents and the disappearance of a very dangerous weapon, the Devil Gundam (Dark Gundam).