Yorinobu, a former IT office worker, is reincarnated into a medieval-style fantasy world. With the help of Kengo, a fellow reincarnate and former foreign investment consultant, he starts working at a merchant's guild. However, with no magical abilities or cheats, he's stuck in a life of low-wage labor, just like in his past life. Recalling his dream of creating a large-scale management simulation game, he decides to enter the magic industry and trade in magic stones to survive. He teams up with Iria, a minor lord and dog-eared beastman, and her attendant Kururu, a cat-eared beastman. Yorinobu has a flash of inspiration: to create the most complex magic circle in the world using worthless junk stones. "With this method, I can rapidly scale magic and surely change the world in a big way." Using modern knowledge to rewrite an undeveloped civilization, this is a grand fantasy about developing and scaling magic at explosive speed!