Buddy Go!

Shizuku Ishiai, a second year middle school student, loves dancing, but is bad at expressing herself, so she crossdresses and posts videos of her dances on the popular website "Smile Douga," under the alias "Ai." And she had declared the "dancing prince," Hayate, her rival. But, after a few unexpected events, and her attempts to best him, she's somehow thrown into an idol unit with him; furthermore, a MALE one?! (Source: Baka-Updates Manga)