Chen Mu finds a card that shouldn't exist and spends every night reverse-engineering its logic like it's the only thing keeping him alive. The gap between what he knows and what the card is telling him never closes, only deepens. By the time Dongwei Academy notices him, he's already become something different from every other card maker in the world, and there's no going back to being invisible.

Chen Mu stumbles on a valuable card in a second-hand shop. His world runs on cards: centuries ago a meteorite strike split the planet into two isolated continents, and scientists led by Rosenberg built cards as a new energy source to keep humanity alive. Chen Mu is only a one-star card maker, poor and with little to his name. He studies card-making theory by day and examines his rare find by night, and his skill grows quickly. Soon his work earns the regard of the top student at Dongwei Academy, and with it come fame, fortune and danger in this action sci-fi ONA.