Haruhi Fujioka stumbles across the Host Club and accidentally breaks a vase, unable to pay for the vase Haruhi is recruited as a new Host despite being a girl.

Haruhi has no problems adjusting to her new duties as a Host and takes an interest in her newest client, with a formal dance coming up she also needs to learn how to dance.

It's physical exam time at Ouran Academy which could spell trouble for someone who spends her days in disguise. Meanwhile, Tamaki launches the Host Club on diversionary tactics, and Kyoya has a backup plan.

Tamaki is jealous of the relationship between the twins and Haruhi. Meanwhile, a young woman obsessed with dating sims declares herself the Host Club's new manager and her first order of business is to give all of the Hosts a "dark side."

Haruhi divulges her secret for telling Hikaru and Kaoru apart, and the rivalry between the twins begins to spiral out of control, causing a dip in the Club's profits.

An elementary student with aspirations of becoming a Host ventures into Music Room 3.