Buddy Go! 

Not only is Ai Shizukuishi bad at studying–she is also a shy and plain girl. However, she has a secret. That is, she takes on the appearance of a boy and performs on Smile Videos, where she becomes Ai, a very popular dancer! Ai only has one goal: surpassing the legendary dancer of Smile Videos–the “Dancing Prince” Hayate! But when Ai catches the eye of a talent agency, she finds herself in an idol unit with Hayate! And now they have to share a room together!? (Source: MANGA MILLION) Note: Includes 16 extra chapters.