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. While posing as a student at the Royal Academy in order to gain access to a certain tome, Yuji is forced to participate in the school's infamous field trip. The first day ends up being a breeze thanks to his trusty Slimes. Learning that the second day is supposedly worse than the first, Yuji wakes up expecting a deluge of monsters only to find... nothing? The forest should be teeming with monsters, and yet there's no sign of any!