Han Xiao, a seasoned player of the game Galaxy, dies suddenly while working through a leveling job. He finds himself sent into the game's world ten years before his own time, reborn as an NPC who still has a player's panel, and he starts out inside the base of the game's villain. To stay alive, he commits to the Mechanic class and devotes himself to growing stronger. His long experience with the game's many versions and their rules gives him an edge. Starting from nothing, he sets out to command an army of machines, bring down the villains and become the strongest. The ONA blends action, fantasy and sci-fi with mecha elements.