Haruhi Fujioka is a studious girl who has recently enrolled at the prestigious Ouran Academy. One day, while looking for a quiet and peaceful place to study, she stumbles across a seemingly unused music room. Upon entering, Haruhi is welcomed by the members of the well-known Host Club: a club in which attractive boys amuse girls from across the entire school. However, when Tamaki Suou—the founder and president of the club—startles the bright scholarship student, she accidentally breaks an expensive vase.

With repayment looking difficult for Haruhi, the Host Club members come up with the perfect solution to the girl's problem: work for the club and ultimately become a Host herself! Mistaken for a boy by her peers, Haruhi has to entertain various female students while coping with her fellow Hosts' extravagant personalities.

In addition to this anime and the source manga, Ouran Koukou Host Club also received a visual novel adaptation for PlayStation 2 in 2007 and Nintendo DS in 2009. Furthermore, it spawned a live-action TV series and film that were released in Japan in 2011 and 2012, respectively.