I'm really enjoying this anime—it's my second favorite isekai of the season! It has a similar vibe to How a Realist Hero Rebuilt the Kingdom, but instead of becoming the ruler, the protagonist works under the king. If you liked Realist Hero, you’ll definitely enjoy this one too. A salaryman gets isekai’d and ends up as one of the Demon Lord’s Big Four, though his role is more of a minister or advisor rather than a combatant. The way he applies his past life knowledge in a fantasy world is really interesting, especially his business strategies. It’s fun to see how modern tactics play out inthis setting.