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' warriors proving to be capable combatants, none is eager to back down, battling tactically among the wreckage of colonies. When Io obtains a prototype Gundam, Daryl will have to make a sacrifice in order to earn enough strength to destroy his opponent and secure Zeon's victory, or he would have to watch as his colleagues are killed by Io.