Is Space Brothers Worth Reading? Review & Where to Read

Quick facts
Format	Manga (seinen), 432 chapters, 46 volumes
Run	2007–2026 · completed
Community score	AniList 8.6 · MAL 8.8 · MangaUpdates 8.7
Where to read	Kodansha — official

Overview

Space Brothers follows Mutta Nanba, a talented but stalled engineer in his early thirties who gets fired from his job on the same day he learns his younger brother Hibito has been selected for a Japanese astronaut mission. As kids, the two brothers swore they'd both become astronauts together. Hibito kept that promise. Mutta, adrift and humiliated, decides — almost on impulse at first, then with growing seriousness — to actually try to catch up. The manga follows him through JAXA's grueling, multi-stage astronaut selection process and beyond, tracking years of setbacks, small victories, and slow personal growth. It's written and drawn by Chuya Koyama, ran in Kodansha's Morning from 2007 to 2026, and is available in English digitally through Kodansha.

What it does well

Mutta is one of the better character studies in long-running manga. He's not a prodigy or a chosen one — he's a competent, slightly stuck adult who has to relearn discipline, humility, and patience in his thirties, and watching him do that convincingly, across years of in-story time, is the whole engine of the series. Koyama resists the urge to rush his growth, which makes every small win feel genuinely earned rather than scripted.

The research is a real strength. The selection arcs walk through psychological evaluations, teamwork drills, technical exams, and the isolation tests real astronaut candidates go through, and the manga clearly did its homework. That specificity gives even quiet, procedural chapters a pull, because you're learning something real alongside Mutta.

What sets Space Brothers apart from most 'chase your dream' stories is how it treats failure. Characters wash out, get passed over, or fall short in ways that would end most manga heroes' arcs, and the story treats those outcomes with real compassion instead of humiliation. It's a series fundamentally interested in what people do after they don't get what they wanted, and that makes its eventual triumphs land much harder.

The supporting cast reinforces this. Fellow candidates, JAXA staff, and Mutta's family are all given enough interiority that their subplots matter on their own terms, not just as obstacles or cheerleaders for the protagonist.

Where it falls short

The pacing is genuinely slow, by design, and the astronaut-selection arcs in particular linger on procedural detail that will test some readers' patience even as it rewards others. This isn't a manga to read for momentum.

At over 40 volumes, the sheer length means some emotional beats repeat: a setback, a moment of doubt, a quiet talk that gets someone back on track. The formula works because the character work underneath it is strong, but by the later volumes you can feel the machinery a little more than you did early on. And because the tone stays so even-keeled and kind throughout, readers looking for sharper conflict or bigger dramatic turns may find it too gentle for their taste.

Verdict

Space Brothers is a rare long-runner that never loses sight of what made it good in the first place: a believable adult finally getting serious about an enormous, specific dream, told with real research and real patience for failure. It's slow and it's long, but it earns both, and it closes out one of manga's most quietly rewarding character arcs.