In this manga adaptation of the popular web novel series, an overworked wage slave finds himself transported to a fantasy world where he quickly becomes the strongest sage in the world... thanks to the help of an army of tamed Slimes! Yuji Sano was a normal guy working a soul-sucking nine-to-five job when he suddenly found himself transported to a fantasy world where he restarted his life as a Monster Tamer. After befriending the Slimes, Yuji is quickly able to gain a second character class, ranking up his stats and learning new skills as he encounters one surprise after another. Yuji puts his mining skills to the test when the group he's teamed up with finds a plentiful stock of Mother Earth's Tears. While en route back to the ship with a life-changing amount of the precious resource, Proud Wolf begins acting strange... or rather, courageous! What's gotten into the formerly cowardly monster? !