What if you woke up one morning, and everything changed?
It's one week before Christmas Eve, and Haruhi and the S.O.S. Brigade (a club for her high school's strangest and most extraordinary students) are gearing up for holiday festivities. But just before the fun kicks off, Kyon, the only "normal" member, wakes up in a weird alternate dimension, one where Haruhi attends another school entirely, Nagato the time-traveling robot is just an ordinary human, and Mikuru (the cute girl of Kyon's dreams) doesn't even recognize him - in other words, S.O.S. Brigade never existed.
The only clue Kyon can find is a bookmark left by the robot version of Nagato, which leads him on a quest back in time.
Written by Nagaru Tanigawa.