Universal Century 0081, two years after the Battle of A Baoa Qu. Although the world begin to resume order, small-scale battles continue to appear in multiple places by the Zeon remnants who continue to resist. An elite unit, known as the Phantom Sweep Corps, is assigned by the Earth Federation to hunt down Zeon remnants. They are led by Hugues Courand. However, a team of Zeon forces known as the Invisible Knights led by Erik Blanke, stand against them.