hmmm there are a few i think are "the best". i think probably junjou romantica, ouran highschool host club, otome youkai zakuro, shugo chara, sekaiichi hatsukoi, fruits basket etc all that stuff i would consider some of the best
ok i suck at choosing one thing i like better than all the others.
marmelade Boy. The world's most convoluted love pentacle. Looking up information on it unfortunately spoils the ending. The thing about the toon is that u honestly don't know whom will end up with whom. (Eh, now that I think about it, doesn't Card Captor Sakura have a similar plot?)
Think of it as a G-rated perzik Girl set in the late 80s/early 90s.
::Inhales:: One guy has a crush on a girl who has a crush on a guy who's just not interested. One girl can't choose between two guys, one guy can't choose beween 2 girls, one guy likes a girl who likes a guy who's way older than her who likes another woman. & then there's the whole convoluted mess between two sets of parents who trade spouses & all live together.