After working himself to death in a hostile corporate environment, Yuuji Sano gets a second chance when he transmigrates to a game-like fantasy world. Although he wishes to lead an unassuming life, Yuuji learns that he has the title of a Monster Tamer, the weakest rank of adventurer. With his newfound skills, he tames a number of slimes around him and, with their help, acquires magical powers to become a Sage—a second profession that capitalizes on such potential.