Fixten
I think this novel is quite good. There are some problems with it, but it does a lot of things really well. The cons I see have to do with pacing. As is the issue of many novels on this site, some stuff that takes chapters (or large portions of chapters) should of been significantly quicker. There are certain chapters where things are repeated or extended to the story’s detriment. The story could also do a better job foreshadowing the reasons behind things especially pertaining to Kai (the main character), but the novel does a good job with the foreshadowing of the events in the story.
All around, it's a really solid book that knows it's niche and sticks to it. MC follows similar path of "quite-super-powerful-genius-who-doesn't-understand-girls" and the whole forced harem thing due to there being considerable less males is a little weird, but I think the supporting cast and world building make up for those minor flaws. I think it is a very well crafted book. Unfortunately, there are a lot of idiot commentary inside, but really solid storytelling.
This is a very good novel, although I do have one minor complaint... In some spots there is some weird english where it's worded strangly. which isn't that big of a deal, but in other cases it will misuse him/her which is very annoying, it isn't a deal breaker, but it still gets on my nerves. Ex: it will describe a masculine man and then describe the man as a her. It's very painful to read and is pretty confusing.
Its starts out pretty chill. Then they introduce some evil young master type character that clearly deserves death, but for sone reason the mc doesnt kill him? Its not really explained that well. Also, I find it unrealistic the 2 high school kids cant report this guy and his family to authorities. On top of that theres supposedly 400mill people and somehow only 3 S Rankers in japan? Unrealistic again.