My Isekai Life 22: 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. 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!

Volume 22 of the My Isekai Life manga series by Huuka Kazabana.