Two brothers look up at the moon and make a promise. One will go to space. One will follow. That promise becomes everything, not because the show tells you it's important, but because you watch a kid decide that moment is his entire future. Space Brothers doesn't treat dreams like abstract inspiration porn. It treats them like the real weight they carry: the sacrifice, the doubt, the years of failure before anything clicks. This movie is where it all starts. A kid in a car with his brother, believing in something stupid and impossible. That's the whole story. That's enough.

Space Brothers #0 is a film prequel to the Space Brothers TV anime. It presents the start of the story, a beginning the original manga never put on the page, and shows how the dream at the center of the franchise first took shape. Blending comedy, science fiction and slice of life, the movie serves as chapter zero for the series that follows.