 If you liked
Hanazakari no Kimitachi e
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 ...then you might like
No Bra
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Both of these mangas feature the concept of cross-dressing and impersonating the opposite sex as a main theme, as well as major romantic involvement. However in Hana Kimi, it is a reverse situation and it is a female who is disguising herself as a man in order to attend an all-boys school.
The art and story of Hana Kimi is much more mature, though.