During the One Year War in Universal Century 0079, armies from the Earth Federation and the Principality of Zeon clash in the Thunderbolt Sector. As Federation pilot Io Fleming leads a charge against Zeon's ace Daryl Lorenz and his team of snipers, this sector of space—known for its frequent strikes of electricity—proves to be a lethal battleground. With both sides' troops proving to be capable combatants, neither side is eager to give up, battling tactically amid the colonies' ruins.