A girl appears from nowhere with a dire warning: humanity is ending. Maetel and Tetsuro, aboard the legendary Galaxy Express 999, find themselves caught in her wake as she vanishes into the cosmos. What begins as a chance encounter at a museum becomes an urgent chase across the solar system, with Tetsuro determined to find answers before it's too late. Racing between asteroids and gas giants, the 999 becomes more than a train through space. It transforms into a vessel searching for truth about a prophecy that threatens everything. Jula keeps slipping away, her cryptic warnings growing more desperate with each encounter. Tetsuro pushes deeper into the void, watching familiar worlds take on new significance as he realizes ordinary locations hold extraordinary secrets. This film balances intimate character moments against the vast, indifferent scale of space. The tone shifts between wonder at cosmic exploration and dread at what Jula's appearance might mean. It's a story about pursuing meaning across impossible distances, where saving one person might be the key to saving everyone.