 If you liked
Kareshi Kanojo no Jijou
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 ...then you might like
Nodame Cantabile
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Both have very similar main male characters - Chiaki and Arima are very similar in terms of character, weakness and humour. Kare Kano has more romance straight off the bat whereas Nodame Cantabile has a more realistic take on romance and their relationship. Both couples have problems for similar reasons - although Kare Kano certainly has a darker feel to it.