 If you liked
Kanojo ni Naru Hi: Another
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 ...then you might like
Boku Girl
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Both series have similar themes:
Both main characters had feminine appearance and obsessed with manliness.
Both turned into a girl.
Both are involved in a love triangle.
Both are having a wavering identity between being a boy or a girl.
Both started to develop a romantic feeling to someone.
The difference: Kanojo ni Naru Hi Another is a shoujo manga while Boku Girl is a seinen ecchi manga.
But I've read them both and I can say this series is the most similar manga to Boku Girl. I felt the same enjoyment that I got from Boku Girl.