My Isekai Life 20: I Gained a Second Character Class and Became the Strongest Sage in the World!

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 ends up enrolling in the Royal Academy in order to get access to a secret book containing information on the evil organization known as the Laboratory. His efforts at keeping a low profile end up being for naught, unfortunately, as news of his exploits on the infamous Evildominus Island spread among the student body like wildfire. While Yuji struggles with his newfound fame, will he actually end up enjoying student life in another world?!