One day, Haruhi, a scholarship student at exclusive Ouran High School, breaks an $80,000 vase that belongs to the "Host Club," a mysterious campus group consisting of six super-rich (and gorgeous) guys. To pay back the damages, she is forced to work for the club, and it's there that she discovers just how wealthy the boys are and how different they are from everybody else.

Ever since the day he helped her up after a nasty tumble, Black Magic Club member Reiko Kanazuki has been obsessed with Hunny. She is devoting all her knowledge of the dark arts to curse him and steal his soul. Will the sweetest member of the Host Club fall victim to her spells?

With the host club members on opposite sides, the sports festival at Ouran High School has become an all-out war! Can the bonds of friendship withstand the strain of competition?

Hikaru and Kaoru's fight over Haruhi is taking its toll on Hunny and Mori, who are trying to watch over the estranged twins. Meanwhile, unbeknownst to Tamaki, Kyoya starts looking for Tamaki's mother in France.

Mei, wanting Haruhi to face up to her feelings, leaves out a magazine that has a checklist for determining whether a girl is in love. As Haruhi reads through the checklist, she realizes that one host may have captured her heart without her even knowing...

The school-wide physical exam has thrown the members of the elegant Host Club for a loop. How can the doctor not discover that Haruhi is a girl?! And once the female customers learn the truth, Haruhi can kiss her job goodbye. But then life for the members will be unbearably boring if she leaves! So the guys start wracking their brains for a solution...

It's summer break, and the Host Club crew head to the beach, dragging our reluctant heroine with them. When Haruhi stands up to some local bullies and gets tossed into the ocean, Tamaki, the Host Club King, rescues her. But afterward, he's so mad that he won't speak to her until she apologizes. Only nobody, including Haruhi, can figure out what she has to be sorry for!

The members of the Host Club have found a way to insert themselves into Haruhi's life yet again, this time by paying her a visit at her humble home. While the guys do their utmost to be polite and unobtrusive, everything they do seems to backfire, especially for poor Tamaki who can't seem to get things right! To make matters worse, he takes a tumble and lands right on top of Haruhi - just in time for her cross-dressing father to catch them in a compromising position!

Haruhi's top ranking falls and she is in jeopardy of losing her scholarship at Ouran. Each member of the Host Club scrambles to become her tutor, but Haruhi picks a female student, Ayame, to help her. Haruhi's time is now spent with Ayame, who can't stand Tamaki. Can Tamaki charm his way into Ayame's good graces so the Host Club can spend time with their favorite member?

It's an all out Cross-Campus Ultra race to determine what group gets the best and most coveted greeting room (aka Central Salon) in which to entertain parents for the upcoming School Festival. Will Host Club outwit and outplay the sheer muscle power of the football team for top spot?

Hunny's little brother, Chika, pays a visit to the Host Club - and immediately starts attacking Hunny, using all his martial-arts prowess against his older brother! Chika seems to be the absolute opposite of his sweets-loving, Bun-Bun-toting sibling, but why is he so angry with Hunny? The Host Club is determined to find out the cause...