Tensei Kenja no Isekai Raifu ~Daini no Shokugyo wo Ete, Sekai Saikyou ni Narimashita~

While working at home, Sano Yuji, an employee of a dark organization, is summoned to another world. There, he receives the occupation of Monster Tamer, a role considered poorly suited to traveling the world. After meeting slimes that read books of magic, Yuji gains magical powers and a second occupation: Sage. He becomes overwhelmingly powerful, but whether he understands the extent of his strength is another matter as he finds himself unmatched in the world.