TLDR: Generic reincarnation with stupid OP power.
This is an isekai enough story where the MC is OP straight out of the vagina. With all this old memories and massive mana reserves, nobody is a challenge and solves everyone's problems. The end. Oh yeah, they make him as girly as possible. There is some ass and tits. You know when you a kid want McDonald's and his mom say "we have McDonald's home"? This is what you get. Some hard bread with Dollard store mince and ketchup. Technically it's a burger, you can eat and not hate it but it's just not as good.