(Time of writing this: Vol 2 completed) Despite the name and tags, it's not like one of your cliche ecchi isekai harem mangas. MC get's isekaied, but a lot of that is ignored and he seems like a plan smart person living life in feudal times. No special gift, skills, or anything other than his knowledge. He's a self-made noble and he's slowly rebuilding the area under his control. I'd say it's a little close to "How a Realist Hero Rebuilt the Kingdom", but with a less peaceful, easy-going feelings and less "everything falls into the MC's lap" feelings and a "darker" MC. As for theharem description, I question how accurate it is. He does have sex with more than one person (separately, not a threesome), and it's clear some girls around him like him, but it feels more like a normal healthy young noble lad's sex life, rather than tasteless woman trying to jump his bones randomly. Contrary to the synopsis there's no indication of him wanting to "aim[. . .] to be the Harem king".

Story feels plan and simple, so if you're looking for something amazing, I don't recommend it, but other than that, I think it's a chill read.