In the year 2184, planet Earth has been ravaged by a freak meteor storm, destroying a third of the planet. But the danger didn't end there. The storm brought with it a race of savege insect-like aliens called the Infestation. These aliens attack all of humanity without mercy. Man-sized ants and roaches, giant-sized mantises and beetles, all raid the surviving cities to no apparent end. The only hope for humanity's survival - a ragtag team of six young men and their advanced mechs called A.R.M.s. Now, these pilots must overcome their differences and face their pasts if they are to bring forth...