Yuuji Sano gets a second chance after working himself to death in a hostile corporate environment when he transmigrates to a game-like fantasy world. Despite his desire to live a quiet life, Yuuji discovers that he is a Monster Tamer, the lowest rank of adventurer. He tames a number of slimes around him and, with their assistance, gains magical powers to become a Sage—a second profession that capitalizes on such potential. Even after gaining overwhelming strength, the scars left by Yuuji's life prevent him from going all out. However, unforeseen dangers threaten to destroy the world that is now his only home, and he may not be able to conceal his abilities for much longer.