When I first read this it was only a chapter or two that was out.
Story goes a former sage/hero who looks like a child, lives in some mansion in the middle of nowhere with 4 maids who are some type of monster or demon. Some guy tries to rob the place with his old magic sword that's how you find out he is the former hero/sage who defeated the demon king or something like that.
it is not an isekai! The robber guy (just some scrub who dies to show who the MC and his minter maids really are) stole the sword. The sword originally belonged to the former hero/sage.
I read it on m.manganelo.com, the manga had a more serious tone to it like a Seinen, the MC was living in exile with the monster/demon maids. I am not really sure what else I can add since it was only 2 chapters released when I read it.