"Bamboo Leaf Rhapsody" is a short story from the light novel The Boredom of Haruhi Suzumiya, written by Nagaru Tanigawa and illustrated by Noizi Ito. It begins on July 7 of Kyon and Haruhi's first year of high school, the Japanese festival of Tanabata. The bamboo leaf of the title refers to the Tanabata tradition of writing one's wishes on small pieces of paper and hanging them from bamboo branches. This is the first time travel story published in the Haruhi Suzumiya universe, however the same time period is revisited in The Disappearance of Haruhi Suzumiya, making for the concurrent existence of at least three Kyon's at one time.
After school in the SOS Brigade's clubroom, Mikuru tells Kyon that she needs to take him back in time to Tanabata three years ago, and Yuki hands him a piece of paper with strange symbols marked on it. In the past he again meets the older Mikuru, who puts her younger self to sleep so that they don't meet. She tells him to head to a nearby junior high school, to help someone at the gates. Taking the sleeping Mikuru with him, he arrives at the school to find a younger Haruhi. He tells her his name is John Smith, and helps her draw strange symbols on the school field. Kyon wakes Mikuru up, and she discovers that her time travel device (TPDD) is missing. They go to Yuki's apartment for help. Although from her perspective she hasn't met them yet, she lets them in when Kyon tells her he knows Haruhi. When she answers the door, she looks exactly the same as she did/does/will in the present, except that she still wears her glasses... or rather, she has not yet decided to stop wearing them. Kyon explains the situation, and Yuki "synchronizes" with her future self, instantly becoming aware of everything her future self knows. Kyon notices that the symbols on the paper she gave/will give him are the same as the ones he helped Haruhi draw, and asks what they mean. She tells him they say "I am here." Yuki takes them to her guest room where she lays out a futon and tells them to go to sleep. She turns out the light and utters something before closing the door. As soon as his eyes are closed, the lights immediately come back on and Yuki is standing there. Checking her watch, Mikuru exclaims that they've gone back to the future, exactly to when they left. The story ends with Kyon, Yuki, and Itsuki in the clubroom discussing paradoxes, after Kyon realizes that he was probably the inspiration for Haruhi's interest in the paranormal in the first place.