When young science graduate Sato Kiko took a job with her mentor inside a giant robot head in Antarctica, she couldn't have imagined that her first day would begin with a battle against the world's most elite soldiers -- or that she'd end up on the run with two complete strangers, fighting for their lives against artificially-evolved animals and hordes of robots. Now, along with her friends Sei and Nagura Ikku, Kiko counts herself among the elite, super-powered group called Guardian Force Roboman, protecting the world from those threats only a giant robot and a very big sword can stand against!