Plot
Kyon is a student at North High School in Nishinomiya. He is dragged along by his classmate, the titular Haruhi Suzumiya, an eccentric schoolgirl who seeks supernatural phenomena and figures, such as aliens, time travelers, and espers. With Kyon's reluctant help, Haruhi establishes a club called the "SOS Brigade" (SOS団, Esu-Ō-Esu Dan), short for "Spreading excitement all Over the world with Haruhi Suzumiya Brigade" (世界を大いに盛り上げるための涼宮ハルヒの団, Sekai o Ōini Moriageru Tame no Suzumiya Haruhi no Dan) (In the school's official paperwork Kyon renamed it "Support the Student Body by Overworking to Make the World a Better Place Student Service Brigade") to investigate mysterious events. Haruhi soon recruits three additional members: the laconic bibliophile Yuki Nagato, the shy and timid Mikuru Asahina, and the unflappable transfer student Itsuki Koizumi. These members soon reveal themselves to Kyon to be the types of extraordinary characters that Haruhi seeks. They have been sent by their respective secret organizations to observe Haruhi—who is unaware that she possesses destructive reality warping powers—and to prevent these powers from being unleashed. Each of the three believe that it would be dangerous were Haruhi to discover she had such powers. Together with Kyon, they work to keep life interesting for Haruhi and to prevent her from becoming bored enough to imagine a new world, as they and their organizations fear that this would destroy the current world.