In this novel, the story takes place from December 17
until December 24
a month after the cultural festival. On December 17
, everything is normal—the SOS Brigade plans to have a nabe
party for Christmas. But on December 18
, Kyon arrives at school to find everything has changed—Haruhi Suzumiya
is missing, and Ryoko Asakura is a normal student. Kyon is the only one who notices anything different. Nagato is an ordinary human, and Mikuru does not recognize him. The only clue is a bookmark left by the alien version of Nagato, which leads Kyon on a quest back in time, where he interacts with the storyline from "Bamboo Leaf Rhapsody
", trying to sort out the mystery and return to his own time line.