Review Detail of in Civilization: Beyond Two Worlds

I haven't read many chapters of this novel, but I'm looking for an almost identical novel but with a character with a largely different mind. does it exist? this novel is good but the main character, his mind bothers me, I have the impression that he is a child in full puberty, it looks like an "isekai" manga, I prefer characters with a very different mind. the story is good, and I'm looking for something similar but with a different character (mentally). there is one thing that I don't understand, there are really a lot of perverts or followers of the "harem" among Asians or what? sometimes it's scary...