Federation forces and Zeon troops engage in a brutal clash within the Thunderbolt Sector, once known as Side 4 'Moore.' The Thunderbolt area is a shallow region formed from wreckage of collapsed space colonies, its name derived from the sparks emitted by metallic detritus. MS pilot Io Flemming joins the Federation contingent sent there, where Zeon marksman Daryl Lorenz stands ready on the front line to repel the enemy's advance today.