Headquarters receives a SDF distress signal from Planet Kowloon, a bizarre world known as the Deserted Planet of Labyrinths. Big One is dispatched, with Ivanov, from Intelligence, accompanying them. Upon their arrival, the crew finds Tille and Liffle, two botanical-humanoid beings that are scientists from another dimension. Ivanov does not trust them and coincidentally, Big One is attacked by a stalking alien vessel. Sirius Platoon's only means of escape is to head towards a dimensional rift, from which their enemy emerged. Bulge senses a trap, but with Big One taking heavy damage it's the only way.

Louis is badly injured from the Alfort Fleet onslaught. As each precious minute passes without proper treatment, Louis' life slips away. The risk of a crewmember's life is of no concern to Ivanov, and he orders Big One to focus on finding a way back to Destiny Station. Captain Bulge disobeys Ivanov's command and orders Sirius Platoon to do everything in their power to save Louis. But something is amiss; another crewmember has been fatally wounded! They have selflessly hidden their severe injury to divert all medical attention to Louis. Will Louis make it? And who has sacrificed themselves to ensure Louis' recovery?

The crew of Big One mourns the loss of Bruce. And to make matters worse, the SDF has subpoenaed Captain Bulge before an inquiry panel to assess punishment for disobeying Ivanov's orders. The jury's verdict relieves Bulge from his command of Big One and Sirius Platoon is completely disbanded, with each member reassigned to auxiliary units. But Bulge learns that the SDF Investigations Division has not followed up on the Cosmo Matrix or the Alfort Fleet attack. And the crew has found evidence of Ivanov's hidden agenda. Against Ivanov's orders, the Big One's degenerates pull out of Destiny Station to investigate the emerging evidence that might possibly absolve Bulge on their own.

The Alfort Fleet has destroyed several junction stations, leaving railways all across the galaxy in shambles. And when SPG Train 666 arrives at Harloom, they find it in utter destruction, not to mention they are completely surrounded by enemy battleships. The captain makes a desperate call to the SDF, hoping to get reinforcements, but static interrupts the signal and an alien voice is overheard warning Headquarters that once Destiny Station is destroyed the Alfort Fleet's mission will be complete. While their enemy speeds toward Destiny Station, Bulge knows what he has to do. He and his reunited platoon fire up Big One and head out.

Bulge's plan is to conserve Big One's resources for as long as possible. When the timing is right, Sirius Platoon will execute a precision attack at the heart of the Alfort command ship. Liffle's commander, Forecis, the leader of the assault on Destiny, will stop at nothing to complete his objective. Not only has the Alfort Fleet taken the lives of numerous SDF members, but the lives of galactic citizens who perished during the alien raid. The galaxy's only hope is Bulge and his crew. When two opposing forces go head-to-head, who will be the one to stay on top?

Thinking the bloodshed to be finished, Manabu is bewildered at the sight of 200 enemy ships emerging. Commander Forecis demands Destiny Station's surrender and he won't be taking any prisoners. When the battle between the Alfort Fleet and Sirius Platoon continues, Commander Forecis sheds his underlying motives. Destiny's railways and arteries running through his home galaxy have caused irrefutable damage. It's only fate that he destroys the last tracks of the Galaxy Railways. But Manabu has never been more determined to prove that people can craft their own fates. Will Manabu's eternal hope be enough to save Destiny Station?