Carrying on his deceased father and brother's will, Manabu Yuuki joins the Space Defense Force to protect the safety of the Galaxy Railways. The fleet transports countless galactic citizens from one planet to the next, protected by the SDF, against terrorists, meteor storms, and malicious alien life. These are the stories of those that travel the Galaxy Railways system and the people that are sworn to protect it.

SDF cadet Manabu Yuuki has gone against all odds, ardently pursuing galactic criminals and snuffing out evil. But when a malicious bomber lashes out, ripping apart a train of innocent people, Manabu is forced to go head to head with his past. Only a young girl, the sole survivor of the train bombing, is kept alive through life support.

During a routine mission, the situation becomes decidedly non-routine as the flames of the past surround Captains Murase and Julia. Can they depend on each other when their lives are on the line? David also encounters an old flame of his own when Big One is sent to rescue survivors from a small aircraft crashed on a remote planet known as the resting place of the most beautiful jewel in the universe.

During a routine mission, flames of the past surround Captains Murase and Julia. Can they depend on each other when their lives are on the line? David also encounters an old flame of his own when Big One is sent to rescue survivors. The Sirius Platoon soon comes face-to-face with a mystery that will prove true love is stronger than dark legends.

The SDF has subpoenaed Captain Bulge to assess punishment for disobeying Ivanov's orders. When the jury relieves bulge from his command, Sirius Platoon is subsequently disbanded. Against orders, Big One's degenerates flee Destiny Station to investigate the emerging evidence of Ivanov's hidden agenda. What they find confirms their suspicion. The Alfort Fleet has destroyed several junction stations, leaving railways all across the galaxy in shambles.

In the future, mankind will venture to the far reaches of the cosmos using technologically advanced trains. The fleet of Galaxy Railways transports countless galactic citizens from one exotic planet to the next, protected by the SDF, the elite force protecting the Railways Fleet against terrorists, meteor storms and malicious alien life. These are the stories of those that travel the Galaxy Railways system and the people that are sworn to protect it.