From Kodansha:
The year is 2025, the older brother decides to trust himself just one last time. It’s the start of an adventure that aims for Mars via JAXA in the town of Tsukuba! The official Space Brothers manga is ready to launch! Two brothers looked to the starry skies as children and made a promise. And now, in the year 2025, the younger brother, Hibito, is carrying out his promise. He is an astronaut who has been selected as a crew member for mankind’s first long-term base on the moon. Meanwhile, the older brother, Mutta, has just been fired from his job and is unemployed. A text message from Hibito sends him applying to be an astronaut and shooting for the stars.

Note: Was nominated for the Manga Taishō in 2009 and 2010. Won the award for best general manga at the 56th Shogakukan Manga Awards and at the Kodansha Manga Award (shared with March Comes in Like a Lion) in 2011. Won the Reader Prize of the 18th Tezuka Osamu Cultural Prize 2014.

Official English: Azuki, INKR
Official French