A place where the girls can fight better than the boys. Well, they have had years of Martial Arts while the new rich kid and runaway idol have just gotten to the mysterious school.
Kind of a Korean Harry Potter...possibly. There are secrets and of course the main characters can't stand each other. But one might be falling for his sister and doesn't even know it. While the other is just too easily infatuated when someone saves him from the sea.
But who knows, one of them might have magical powers.