Ôran kôkô hosutobu (2006)

At the ultra prestigious Ouran High School, Haruhi Fujioka looks for a quiet place to read and walks into an unused music room, and accidentally stumbles across the notorious Ouran High School Host Club, a group of boys who entertain the girls of the school for profit. When Haruhi accidentally breaks an expensive vase belonging to the wacky Host Club, she is made to serve under them until her debt is paid off. Haruhi is soon made a Host, but in order to pay off what she owes, she must continue to allow the Host Club's customers to believe she is a boy.