So without spoiling:
-Overpowered main character
-Different world (Isekai)
-Harem
-Hentai version

Now mix these all together and make it cute, perverted
and make everything seem ... easy, chill and without complications.

That's all I really need to say. It's an amusing manga with a cute storyline and many girls (I don't really remember guys in the story).

Don't read it if you don't like lot's of lewdness which kinda takes over the story towards the end. I'd also suggest it be 16+ age but ¯_(ツ)_/¯


More (more spoiler-ish):
You view the story though the eyes of the main character and he's very lax and doesn't care that much. Like most harem stories they always get the girl, and in this case he actually gets each and every one of them ;D