My isekai life I gained a second character class and became the strongest sage in the world! Volume 17

"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. In a forest infested with ghostlike monsters called wraiths, Yuji finds a facility of an organiza...