I won't go into too much detail, because part of the fun of this anime series is just hanging on for the ride, not knowing alot going into it.
But basically the story is about a girl who enters a very nice, prestigious high school where rich kids are numerous and poor people are thought of as fairytale material. She meets the highschool's Host Club, which is basically a group of young men who entertain the school's young ladies. Keep in mind they're all rich, and somewhat arrogant, so they kind of just sit around and talk about rich kid stuff.
The Host Club thinks she's a guy, she accidently breaks an expensive vase and instantly earns herself a very large debt, and the only way to pay it off is to join the Host Club.
This is just the beginning. Like I said I don't want to go into too much detail because Ouran High School Host Club is the type of anime that is best enjoyed when not too much is known about it going in.
I was mainly interested in the series because I thought they were all guys (she looks like a guy when she works as a "Host Boy") and I thought it would be fun and romantic (and gay) to watch.
It is fun, and romantic too. But Its not what I expected. However, I never thought it would be THIS good! I am really enjoying the series (almost finished with it) and I like how each episode brings enough humor and character movement to keep you interested. And speaking of the humor, I find myself laughing out-loud alot. This type of comedy is just the thing I have been looking for. And there's just enough gay humor too!
The animation is really cool. Very detailed, and cartoonish (if only to add to the comedic effect). The music is nice, but nothing worth freaking out over.