16-year old Izumi Yokisha is a sassy bad girl filled with Big Apple style and attitude. She's now transferred from her school in New York to Ouran Academy in Japan. The elite Ouran Academy is where the filthy rich families send their children to have a fine education.
There, the Ouran High School Host Club exists, where the handsomest boys, with way too much time on their hands, host and entertain the ladies who also have way too much time on their hands. An elegant play-ground for the super rich and beautiful.
Izumi then gets dragged into the world of the Host Club, where she takes photos and helps make the photo books. She immediately hits it off with all the boys, especially with Tamaki, the "king" or leader of the club.
Izumi, being a part of the club gets dragged along for each ridiculous adventure, and adds her "rules" of survival for each one into a "rulebook".
But the rulebook can't have instructions for everything, like how to deal with enemies, drama, loss, friends, and even worse, love.