During the year AD 2045, Aizawa Ryota was a trainee in the third grade at the Central Military Academy. Along with his companions Nagase Saka and Nittak Kazuhiko, Ryota flew to the Aries space station as part of his instruction. Regrettably, the station was assaulted by the terrorist association Hallarax, causing their endeavor to be ceased. In space and with no salvation in sight, Ryota and the other trainees must devise a plan to get back to Earth safely.