In the future mankind will venture to the far reaches of the cosmos using technologically advanced trains, perhaps the least likely method of intergalactic travel. The fleet of the 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. Manabu Yuuki dreamed of joining the SDF like his father and brother before him. His mother, desperate not to lose her whole family to the infinite void of space does what she can to derail his dreams, but Manabu is too much like his father, too stubborn to go back on his word. He boards the train to Destiny Station, where his own destiny has already begun.