The first time I tried to read this manga, I dropped it in 3 pages... the reason? I found myself with that literary excuse authors use in recent works with fantasy/Cyfy elements to try to make the generic MC "interesting" or "special" so hard that more often than not they actually remark it with big ass characters in the title, only to contradict it, ignore it or even forget it as the series goes on.

IE:
-Having the weakest magic that exist, but it's actually OP ancient magic mistaken for useless magic.

-Having a flawed skill, but it's actually an OP skill that no one knew how to use before.

-Having a useless class, but it makes you OP if "this" or "that" happens.

-Being reincarnated as the weakest race, but it's actually OP... Somehow...

In this series in specific the first three pages were the MC explaining "I have very low intelligence" while he killed a demon lord looking enemy in one punch with his ridiculously unbalanced physical stats, I decided to stop right there as I could imagine how this series would go, but after retaking it a few days ago I discovered I was right... Yeah...

The element of "Low intelligence" that was presented as MC's quirk disappeared with no reason... Or maybe I just find most isekai MCs stupid so I couldn't feel the difference.
The series appeared to be just a generic "MC center of the multiverse" harem isekai, but after reaching as far as half this series I discovered I was right... Yeah...

If anyone read to this point, they may already be asking themselves,

"...If you think the manga was bad, then why rate it with an 8?"

The answer would be the ending...

But before that, let's talk about character development. As many would know, character development is a foreign existence in harem isekai in general, why? Because if the heroines are not cardboard they'll notice MC is just some random twerp and if other male characters develop a bit, a TINY LITTLE BIT, the may become better than the random MC and we can't have that happen (apparently).

An harem MC can not have "equals", only "followers" that he treats as his equals because "he's a great person worthy of everyone's respect".

I ended up "liking" this manga because it had the most unlikely character development that anyone could imagine and the ending, more specifically the final battle, was great because that character development was tangible in there.

The only thing I can say without spoiling (I consider it good so spoiling would feel bad) is that a three on one fight against the final boss, not for the protagonist but out of their own personal motivations and free will, completely made this bad manga worth it...

How old is the author seriously? I'm sorry but the dialogue is absurd and the MC is so stupid and unlikable it's baffling like he doesnt use his brain at all. You'll find better isekai harem than this bs.