The starship that Alan Corinth, an imperial starfleet soldier, boarding on, is seriously damaged by a mysterious attack in the middle of sailing through the hypers.p.a.ce. Being on board entirely by accident, he became the sole survivor. The seriously damaged starship couldn’t continue to sail and crash down to the planet before his eyes. Alan escaped alone to the planet through an escape pod. The survival of Alan, the naval soldier who was thrown into the unexplored planet, and [Nanomu], the nano machine coexisting with him, starts. Even while being at loss in the fantasy world of swords and magic, Alan lives with all his might with his friends. What will Alan achieve in this planet? SF fantasy set in the middle ages hereby unfolds.