Captain Monica launches a secret mission, "Operation Thunderbolt," and selects Io to pilot the Atlas Gundam. She leads the assault landing ship Spartan into a part of the ocean effectively ...

During the One Year War of U.C. 0079, the Earth Federation and Principality of Zeon engage in a fierce battle at the "Thunderbolt Sector", a shoal zone in the former Colony Side 4 "Moore".