Uchū Kyōdai (宇宙兄弟) is a Japanese manga series by Chūya Koyama serialized in Weekly Morning. It has been nominated twice for the Manga Taishō, in 2009 and 2010. In 2011, it won the award for best general manga at the 56th Shogakukan Manga Awards and at the Kodansha Manga Award (shared with Chica Umino's March Comes in Like a Lion). It was adapted into a live-action film and an anime series in 2012.
One night in 2006, when they were young, the two brothers Mutta (born 1993) and Hibito (born 1996) saw what appeared to be a UFO heading for the moon. They decided that night to both become astronauts and travel out into space.
In 2025, Hibito has become an astronaut, and he's going to go to the moon. Mutta ended up following a more traditional career path with an auto development company as an engineer. However, Mutta just ruined his career through a violent altercation with his boss. Now, not only has he lost his job, he appears to be blacklisted in the entire auto industry. Maybe this is a rare opportunity for Mutta to once again chase his childhood dream and become an astronaut like his little brother!