Eight years ago, Ares, the legendary mecha warrior, slew the ultimate monster Bahamut and saved humanity — then vanished into obscurity, opening a mecha repair shop and quietly raising his adopted daughter Mira.
Eight years later, when Mira is humiliated in a mecha combat tournament, Mars steps in and defeats her opponent with a single blow, exposing his true identity as the legendary hero. As monsters return and the terrorist organization 17N plots to resurrect Bahamut and rule the world, Mars dons his armor once more to save his daughter and protect humanity.
Piloting the new-generation Ares II, he charges into the Arctic battlefield — and punches the monster to pieces, saving Earth once again.
