Season 1

Arrival of the military students and passengers on Aries Station. Commencement of their training.

Shuhei, Aki and Aya arrive. Ryota buys time for Sayaka during a training simulation for her to find Aya and tell that she will not be able to see each other.

Warning klaxons signal an emergency. Terrorists begin their attack while the crew and passengers attempt to evacuate.

Some are stranded on the station. Shuhei and Cellaria are injured in battle. Flashback to Nao's childhood.

Flashback to Aki's childhood. The military students prepare for a counter-assault on the terrorists.

Cellaria is captured. Shuhei attempts a rescue.

Discovery of a strange virus. Cooperation occurs all over the station for survival. Nao is injured in an attack.

Nanami is found. The terrorists are double-crossed. Flashback to Yu's childhood.

Shuhei is being corrupted. Yu is captured but escapes with the help of her childhood friend.

Cellaris's past is revealed. The military students make plans to leave the station.

Aya manages to escape at the cost of Gale's life who ensures her safety.

With the station starting to burn up in the atmosphere of Earth, the rest of the crew commenced the evacuation of the station. The event shifted forward for 1 year, where everyone returned to their normal lives. Most characters' futures were revealed as well.