Universal Century 0079, during the One Year War, battles between the Earth Federation and Principality of Zeon break everywhere. Around the debris of Side 4, called the Thunderbolt sector, snipers from Zeon's Living Dead Division have been killing off EFSF's mobile suits one after another. Fiery pilot Io Fleming finds his archenemy among one of the snipers and dedicates himself to beating him, especially when he finds out that the sniper has lost both his legs. Piloting the prototype Full Armor Gundam, Io Fleming flies off fighting the snipers until ultimately comes face to face with Daryl Lorenz in the Psycho Zaku.