Seeking quietude for study at an elite academy, honors student Haruhi Fujioka comes upon the school's Host Club - six elite boys who host parties for girl classmates - and becomes its newest and most reluctant member.

Kanako the chronic host-hopper (a girl who changes from host to host at regular intervals) gets the attention of Host Club, who decide to target her for happiness.

Tamaki, jealous that the twins get to spend far more time with Haruhi than he, wants her sex revealed, but that may occur on its own with school physicals coming.

A delusional girl obsessed with Sims (virtual people) believes Kyoya (who looks like one of them) is her fiancé and forces herself on Host Club as its new manager.

Haruhi's ability to tell one identical Hitachiin twin from the other sparks a furious fight between the twins.

Enjoyment at a family-owned indoor tropical pool park turns into a Jurassic Park-like disaster for Host Club members due to discarded banana peels and live alligators from the tropical exhibit.

A day at the beach is a working holiday for the Host Club, but the boys also decide upon a game to see who among them can discover Haruhi's fear.

The Zuka Club, from a rival all-girls academy, challenges the Host Club for the fair hand of Haruhi, whom they feel has been woefully mistreated by the enforced subjugation of her superior gender.

The Host Club boys pay a surprise visit to Haruhi's home, curious as to how horrifyingly destitute her Commoner's Life can be.

The Host Club handles sibling issues between Ouran's Prince of Darkness and his light-loving little sister, Kirimi.

Honey chafes at being deprived of sweets because of a tooth cavity, and Mori blames himself for not watching out for him more carefully.

Is Haruhi dreaming when she falls down a rabbit hole in Music Room #3 and meets Alice in Wonderland characters who, like characters in Oz to Dorothy, all look strikingly familiar?

While Host Club is a complete success, the Newspaper Club is not, but its president would like to change that with an exposé on the Host Club.

Haruhi takes a summer job at the bed and breakfast of her father's friend, which bends the host boys out of shape over being abandoned, so they follow.

Hikaru and Tamaki's insecurities show when Haruhi runs into a male friend from middle school days, but while Tamaki recovers, Hikaru does not, so Kaoru steps in for his twin's sake.

On the last day of summer vacation, Tamaki decides the elite members of Host Club should go on a field trip to observe commoners in their natural setting - a shopping mall.

Honey's family relations are reviewed after younger brother Yasuchika drops by Ouran High School to give Honey a good thrashing.

The Zuka Club girls from Lobelia Girls Academy get Haruhi to star in their annual theatrical production honoring President Benio's late mother, but it's really a plot for revenge.

How the Hitachiin twins come to accept Tamaki's offer to join a new club he's forming.

Haruhi's class puts on a Halloween After Dark Test of Courage Tournament, where the Hitachiin twins take delight in tormenting their multi-phobic class rep/teammate.

The heir to a crime syndicate comes to Host Club to be Mori's apprentice, hoping for a share in his secret of having friends while owning a scary face.

Having discovered Haruhi's gender secret, Kasanoda comes to Host Club to court her, unaware that his actions misidentify his sexuality.

Told in flashback, Kyoya recalls for Haruhi how he and Tamaki - a very unlikely pair - got together to start up the Host Club.

The Ouran High School Fair provides the catalyst for a pair of disapproving fathers to tip back into their sons' lives, with public humiliation for one and an arranged marriage for the other.

With Lady Éclair keeping Tamaki incommunicado before whisking him off to France, remnants of the Host Club make an all-out effort to reach him.