A ten-year-old orphan boards a train that stops at dying worlds, each one teaching him something about what it means to stay human when everyone else is buying immortality. The Galaxy Express 999 moves slowly enough to break your heart at every station. Tetsuro's real journey isn't toward a mechanical body, it's learning why mortality, loss, and the people you meet matter more than forever.
A train crosses the stars, and a boy boards it seeking vengeance and salvation. Tetsuro lost everything when Count Mecha destroyed his world, killing his mother and leaving him broken in the rubble. When a woman named Maetel appears with an impossible offer, Tetsuro accepts without hesitation: travel with her aboard the legendary Galaxy Express 999, a locomotive that tunnels through space itself. The legend promises a free mechanical body to anyone who reaches the final station, granting immortality and freedom from human fragility. But the journey demands more than hope. At each cosmic stop, Tetsuro and Maetel encounter worlds twisted by greed, power, and the blurred line between humanity and machinery. Some characters seek transformation on the train. Others want to destroy it. Tetsuro must navigate betrayal and wonder in equal measure, slowly discovering that his quest for revenge carries consequences far beyond personal closure. The train keeps moving forward, carrying a boy who learns that becoming immortal might cost him everything that makes him human.