The Melancholy of Haruhi Suzumiya, Volume 9 — Nagaru Tanigawa

Following the clues in the clubroom, Kyon travels back in time to a familiar place...the same time and place he came with Asahina last summer! Kyon again meets with the elder Asahina, but she has no idea what's caused the future to go awry - erm, to go normal. Stoic Nagato is not surprised to find future Kyon at her door (for the second time that night) and prepares a program that will repair the rift. But the decision to administer it or not lies with Kyon...