I always thought this show was pronounced more like Jean but it's actually Joan. ANN categorizes this as a Adventure, Comedy, Drama, Fantasy, Historical, Magical Girl, Mystery, Romance, Shoujo, and it's so true. After reading Full Moon o Sagashite and seeing it's anime I decided to give another one of the same manga-ka's works a try. I really did enjoy this anime but I also didn't think it was the best anime out there, and if I know one thing about this manga-ka I know that her manga are always better than the anime counterpart. I really liked KKJ with it's quirky characters, especially Chiaki, the perv =D. I also really liked the episodes where the nerd gets taken over by a demon and then he turns all cool ^_^. The one thing I didn't like most about this anime was the ending. I think that the first season was much better than the second season compared to the Full Moon anime where I said the reverse.
I think overall KKJ deserves a 7.5/10.