December 16: the S.O.S. Brigade is being dragged around as usual by a spirited Haruhi, who decides to hold a Christmas party. Kyon dreads the inevitable trouble that will arise. December 18: Kyon awakes to what he thinks will be another day full of Haruhi’s mischief. To his shock, he finds that things have changed. Everyone’s memory of the last few weeks has been altered. More importantly, no one in his class has heard of Haruhi Suzumiya. Kyon goes to seek answers from the S.O.S. Brigade members, only to find that they don’t know who he is. At wit’s end, Kyon siezes upon a clue that could unravel the universe itself.
Kyon thought he was going to have a normal, uneventful high school life. Then he meets Haruhi, who claims she has no interest in ordinary people. She chooses him on a whim to be her partner in creating the SOS Brigade, her own after-school club to search out everything mysterious and wondrous in the world. They are joined by three peculiar people: the taciturn Yuki, the shy Mikuru, and the gregarious Koizumi. Although Haruhi never seems to acknowledge the strange events happening all around her, Kyon is let in on the secret, and discovers that he plays a pivotal role in the preservation of the world.