Read Manga Uchuu Kyoudai online in English. Also known as Space Brothers and Uchū Kyōdai.

Two brothers once stared at the night sky and made a bold promise after glimpsing what looked like a UFO streaking toward the moon. Nearly two decades later, the younger one, Hibito, has turned that childhood vow into his everyday reality as a JAXA astronaut chosen for a pioneering lunar mission. His older brother Mutta, now in his thirties, has spent years drifting through ordinary jobs until a sudden layoff leaves him staring at the same stars with fresh regret.

A message from Hibito reignites something long buried in Mutta. He signs up for the grueling astronaut selection process, where every simulation, interview, and moment of doubt tests his resolve and forces him to face how far he’s fallen behind. What unfolds is a grounded mix of quiet humor, sibling tension, and the raw effort of trying again when most people would have given up.

This series may appeal to readers who enjoy slice-of-life drama, realistic space exploration tales, and stories of perseverance and family bonds.