Renton, the son of scientists, grows up with Eureka, a girl who cannot bear sunlight, forming a deep bond. When Eureka is suddenly abducted, Renton, initially helpless, swears to save her. Joining the military, Renton's remarkable skills lead him to the Independent Youths Unit 303 of the First Mobile Forces, where he pilots Nirvash, a bio-mechanical suit. Little does Renton know, a conspiracy unfolds to thwart an ongoing alien threat, entwining both him and Eureka in a mission of peril and destiny.