A-TEC, directed by brilliant engineer Kaito Sera, is excitedly awaiting the arrival of their newest member in the Martian colony Fourth Tokyo. However, it quickly becomes evident that the transfer student is anything but ordinary—Nagisa Kiryuu, the recently appointed head of A-TEC and the younger brother of the corporation's CEO, is dispatched to shut down the program. To keep the classroom alive, Kaito and his pupils labor feverishly to construct a successor to their most powerful rocket, the X-2; in the meantime, Nagisa climbs the corporate ladder in pursuit of his own objective. Regardless, their individual conflicts eventually expose that there is much more going on in Kirishina Corporation than meets the eye.