Sigh. And this WAS one of the better "Isekai" mangas. Or it seemed to be at first. But it is rapidly deteriorating into a simple wish fulfillment fantasy. (And it's getting squickier and squickier. Quite pointlessly too. It's now on the fence of being a full blown hentai.) The main character was an overpowered character from the get-go, in terms of fighting. That COULD be ok, if it was done well, and if the manga wasn't all about the fighting itself. And it wasn't done too badly. And the fighting itself was indeed irrelevant to it. But that's not the problem.
The problem is his harem. Damn, it's just falling in line with SUCH an idealistic situation now. It's just too perfect, and he faces no real adversity. He's like an UNIRONIC one-punch man who gets a harem. So about that. The main character's goal in this alternate universe he finds himself in was to build a harem of 100 girls. A lofty goal to be sure, but it could be done right, particularly if he soon comes to the realization that it wouldn't be as good as he imagined and ran against the underlying humanity of the first few girls and faced with the dilemma of not wanting to make them unhappy in the process of his quest by marginalizing them to being one of a crowd. One would think this would be an inevitable realization if he ACTUALLY liked them, so since he hasn't realized it, there's fundamentally a limit to how much he CAN like them, if he's willing to continue this quest, they inevitably HAVE to be mere possessions to him if he is to justify getting still more. And now he's made some headway, having 4 girls who now live with him, but he really should come to the realization at some point that there wouldn't be any point to going further than that... IF he really liked any of them. Because I guess he doesn't. It doesn't look like that's the way it's going though. And that's why it's ironically unsatisfying. It's trying so hard to satisfy the readers' desire, that it's unsatisfying.
Additionally, the girls are SUCH idealizations, they're SO perfect, they have amazing talent, AND they have INCREDIBLY bad self-esteem, they think he's SO out of their league and they're SO lucky to have him, and that makes them jealous of each other and all the more eager to please him in any way possible (so apparently they like him a lot more than he likes them, this is so one-sided), but it's just so absurd, especially the one who pathologically loves doing chores. I mean come on. How much of an ideal situation can you contrive? Oh and she's like this GENIUS at housework, she doesn't just like it, she's supernaturally good at it, she's like the Jesus of housework, being able to feed an army of people with like a loaf of bread as starting ingredients and to turn it into a massive feast with quality like at a 5 star restaurant.
And the attitudes of everyone are so weird. He saves a village from attackers and the village elder gives him as slaves the 2 adorable girls he had already taken a liking to, and the village elder (who is also a smoking hot girl) is so THANKFUL for him having the GRACIOUSNESS of taking her two townspeople on as his slaves, like he's taking on some incredible burden, as if he was doing a valuable service and not receiving something of enormous value instead. She was like 'wow, you'll take these 2 beautiful girls as your slaves for NOTHING, you'll just accept them for FREE?! Wow, you're so generous!' I'm metaphorically facepalming the whole time (actually I'm staring at my computer screen with a blank stare), like how am I supposed to believe this. I UNDERSTAND the underlying motivation in this. I really do. This IS the male fantasy in the modern world. It's a fulfillment of man's desire for a woman who is the exact opposite of all the women to be found around him in real life.... and not to just get one, but a bunch of them while he's at it, because why not; women who are beautiful, charming, have valuable talents, will do the housework with a smile and don't have ungodly high opinions of themselves and so they'll actually value him. But it's just such an extreme. It's just so ridiculous. And it's just gotten out of hand. There needs to be some conflict. Like maybe one of them needs to die. That's an idea. I'm sure the author isn't reading this.