A direct quote from the manga - "Common sense doesn't exist here, but happiness surely does" I really hope that quote sets the right expectations for you. This is MC adventuring with MILFs and having lots of sex. Technically, There is a background plot of demon lord + hero. Its very generic with the "hero kicked me out" formula except for the MC marrying the mothers of hero party's members and forming an adventurer party with those MILFs. The payoff is probably seeing the downfall of hero's party, as they realize how much MC was carrying them with paperwork/chores/coordination and so on. If you are inthe mood for some Isekai trash and won't mind explicit sex scenes, this will be a good read. The story won't make much sense, so please turn off your brain.