Tensei Kenja no Isekai Life: Dai-2 no Shokugyou wo Ete, Sekai Saikyou ni Narimashita  

転生賢者の異世界ライフ ～第二の職業を得て、世界最強になりました～

In this story, we have a character named Sano Yuuji who works for a black company and gets transported to another world while working from home. His job in this new world as a Monster Tamer isn't very conducive to becoming an adventurer, but he manages to gain magical powers through some slimes he met who read magical books. As a result, he acquires a second profession as a Sage. Despite his immense power, it's unclear if he's fully aware of his strength or if he's blindly pursuing the title of being the strongest in the world.