“Endless Eight”
“Endoresu Eito” (エンドレスエイト)

Somehow summer vacation has repeated like the previous episode. Kyon is wracked by a sense of déjà vu. Itsuki is likewise troubled, while Yuki seems even more detached than usual. They finally figure out that Haruhi has put the last two weeks of August into an infinite loop because she refuses to let summer end. They find out that the loop has repeated 15,498 times with slight variations, but none of them can devise anything to stop the cycle from repeating. Upon their last meeting in a restaurant on last day, Kyon calls out after Haruhi in a last-ditch attempt to stop her from leaving, but fails to think of anything he can do, and she leaves. As the last day of vacation arrives, Kyon, resigned to the loop repeating itself, goes to bed without finishing his summer homework.