In the summer of 2006, Mutta Nanba and his younger brother, Hibito, witness what they believe to be a UFO, which flies off towards the moon. Hibito decides he will go onto the moon whilst Mutta decides he will aim for Mars. Nineteen years later, in the year 2025, and Hibito has become a fully fledged JAXA astronaut assigned to go on a mission towards the moon. Mutta, on the other hand, has not been so successful in achieving his dreams. As Mutta eventually recalls his past ambitions, he receives a letter stating he has been accepted to join a JAXA training program for new astronauts. The series follows Mutta as he seeks to become an astronaut and achieve his longtime dream just like his brother did
