Cinderella Boy

Cinderella Boy summary:

One of the five handsome men in the incredibly popular idol group "Z", Yoshimura Riku, is actually a girl! She's tied with the leader, Touya, for popularity. She pretends to be the type of guy that makes all the girls smile and is extremely cool-looking. However, when she receives a Christmas present from Touya, she decides she wants to show him her feminine side...!? -- ShoujoMagic