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… The official Space Brothers manga is ready to launch!
In Space and on Earth, all things are connected. That is the feeling behind "We Are Space Brothers." With that power in their hearts, Mutta and Hibito set off on their first joint mission to scout for water resources! In pitch black caves where they can't see even an inch in front of their faces, will Hibito be able to complete the investigation without remembering past trauma? And will they be able to discover the water resources?