You could try reading Power!! but she gets discovered by the middle of the story if I'm not mistaken. Anyway I recommend it because it's quite funny even if it doesn't exactly match your request.
________________
Does not compute.
Manga Poll
Manga is the Japanese equivalent of comics
with a unique style and following. Join the revolution! Read some manga today!
Join #baka-updates @irc.irchighway.net
RSS Feed
Forums
Successful Cross-Dresser?
From User
Message Body
?
Member
3:26 pm, Mar 31 2011
Posts: 228
Member
11:16 pm, Mar 31 2011
Posts: 707
Kuragehime!! <3
Member
11:25 pm, Mar 31 2011
Posts: 1
11:25 pm, Mar 31 2011
Posts: 1
Shugo Chara if animes count. Haha. 
Not the main character, though.
Not the main character, though.