Ground Rail Field Service

As the name suggests, Orbital Messenger is a story about a courier in an underground world with a post-apocalyptic future. The rules of this world are very simple. The courier delivers materials to help rebuild human civilization. The protagonist is just an ordinary person without any special abilities. His development from a preliminary courier to a professional high-level courier, although he is just a grain of sand in the world, he can survive with his tenacious will and use his own heat to promote the operation of the world.