Zenkai Girl is what everyone needs to be watching right now.
I find Ouran really over-the-top and awkwardly so. Hana Kimi was the better slap-stick school comedy despite what people may feel about the adaptation.
Now, Zenkai Girl on the other hand is a great blend of reality and drama. It deals with some very legit problems working families are facing today, especially with single parents, but in a light-hearted way while still being very much grounded.
The adults do the "raising," but it's the kids who do all the teaching haha.