The stage of the story is seven years after the end of the war in the year of Mobile Warrior Gao Da. After the end of the war, some of the military forces of the Duchy of Jean did not subdue and continued to have military conflicts with the Earth Federal Army in various places, so the radical exclusive force Titans, which strongly advocated hunting down the remnants of Jean, was formed. As a result of Titan's tough and bloody crackdown on the inhabitants of the universe, the anti-force Ogan A.E.U.G. (translated as Aogan in Taiwan and Augu in Hong Kong). The story begins in the Universe Century 0087 (U.C. 0087), the first half mainly revolves around the confrontation between the two factions of Okan and Titan, and the remnants of Jean in the middle appear on Axis, wrestling with Okan and Titans and waging a fierce battle.