Aggressive cat, mischievous dog

You've always heard about girls that when you call the cute, the say ' thank you' but, have you ever heard about the kind of girls that when you tell them they're cute, they call you idiot?

Well then, meet Kitty, a.k. Kitty cat, with long black silky hair and green piercing eyes just by walking next to her, you can't avoid stare at her. Her personality is something you can never understand, sarcastic, aggressive and cold are the words that describe her perfectly. She always gets what she wants, even if that means that she will hurt you, she won't doubt to do it to get her objective, but, if your someone special to her, she will do whatever is necessary to make you happy.
The only two persons that know the reason of her personality are Maika and Zack, her tow best friends and the 'most hated person in her life'. But that so hated person is very important in this story, Jasper.
Jasper is the player guy type of the highschool, completely the opposite as Kitty, but at the same time, completely the same. And is that, Jasper knows the black haired girl since always, but something changed back years ago, something that made them to fight always like a cat against a dog. But Jasper is determinate to bring back again the old girl that was always smiling, happy and cheerful, even if that means that he has to go through again, her now stone heart.

Who says that cats and dogs can't be together at the end?