Space Brothers(2007)

Uchuu Kyoudai

Two brothers looked to the starry skies as children and made a promise ... Now, in the year 2025, the younger brother, Hibito, is carrying his out. 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, but decides to trust himself just one last time. A text message from Hibito sends him applying to be an astronaut too and shooting for the stars …

(Source: Kodansha USA)

Notes:
- Nominated for the 2nd and 3rd Manga Taisho Award
- Won the 56th Shogakukan Manga Award
- Won the 35th Kodansha Manga Award in the General Category.