Harry Styles. Kelly Andrews. Even though they had only known each other since 9th grade, they went together like glue and paper. Salt and pepper. Peanut butter and jelly. They were Batman and Robin, completly and absolutly insperable. Then, the X-Factor comes and Harry is gone. And those two made a promise. They would never loose touch with one another. Their promise was unbreakable, just like them. But sometimes, people change. And so do their promises. Or, do they?