The Melancholy of Haruhi Suzumiya (light novel) (The Haruhi Suzumiya Series, 1)

Meet Haruhi - a cute, determined girl, starting high school in a city where nothing exciting happens and absolutely no one understands her.Meet Kyon --- the sarcastic guy who sits behind Haruhi in homeroom and the only boy Haruhi has ever opened up to. His fate is now tied to hers.Meet the S.O.S. Brigade - an after-school club organized by Haruhi with a mission to seek out the extraordinary. Oh, and their second mission? Keeping Haruhi happy . . . because even though she doesn't know it, Haruhi has the power to destroy the universe. Seriously.