I found this manga to be an interesting mix of reality and fiction. The reality being that, yes ... historically, there have been many distinguished families that promulgated incest for furthering family lines. The fiction here, is they let one get away ! The children of these type of pairings are usually hidden away, especially if they aren't mentally acute. Or otherwise they, (and everyone else), are lied to about their parentage for societal acceptance. BUT ... this one has a happy ending ! And the art is lovely ! LOL, (pardon my rant !)
Kiss Me