Gorou Saruwatari and Lostman are mountain climbers who have ascended some of the highest mountains around the world. At the peak of Mount Everest, they see the ISA Space Station in the sky above and become determined to go into space. At the same time, ISA begins a program to research and obtain a new energy source which has been discovered on the moon. Gorou and Lostman attempt to join the program through different approaches: Lostman becomes a pilot and Gorou takes a job as a construction worker.