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

Yuuji Sano, a black company employee, is summoned to a fantasy world while working from home. There, he discovers he's destined to be a Monster Tamer, a profession often associated with limitations in becoming an adventurer. However, after befriending and learning from some intelligent slimes who studied magical texts, Yuuji gains magical abilities and becomes a Sage, a rare dual profession.