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

Sano Yuuji, a black company employee, is summoned to another world while finishing his work at home. His profession in the other world, a Monster Tamer, is considered a job that makes it difficult to become an adventurer. However, thanks to some slimes he met, which read several magical books, he gained magical powers and the second profession, Sage. Yuuji acquired overwhelming power, but is he conscience of his strength? Blindly becoming unparalleled and strongest in the world! (Source: MU)