On the closing months of the One Year War, a unit of RGM-78A Gundams, mobile suits derived from the titular RX-78 Gundam but was passed over for the GMs when it came to mass production, fought as the centerpiece of the war's most pivotal battle. These are the stories of the machines and the brave men that piloted it. Outnumbered but never outgunned, they fought in an Iron Storm!