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In the year AD 2045 at Aries, an old tourist space station outside Earth’s orbit doubles as a preparatory training facility for the Central Military Academy students, the temporary home of Aizawa Ryota, a third year, and his classmates, including his love interest, Nagase Sayaka, his unacknowledged rival, Nittak Kazuhiko, and the proclaimed genius Aizawa Shuhei, his older brother.

The space station is attacked by the terrorist group, Hallarax, and after helping in the evacuation of the majority of the civilians and staff, Ryota, his friends, and a handful of others are left to battle for control of the space station as Hallarax threatens Earth with nuclear retribution.