AKB49: Renai Kinshi Jourei

Urayama Minoru is a care free boy who has no interest in the idol group AKB48. On the other hand, he does worry about Yoshinaga, his fellow classmate. She wants to become a member of the group and auditions for a spot, so Minoru goes undercover as a female in order to help Yoshinaga with her stage fright. Words of encouragement can only go so far however, and the web Minoru finds himself in is getting bigger.
(Source: MangaHelpers)