Looking back on your youth, you have always been the person you didn't want to miss the most over the years. But this time, I really missed you. The film is based on the travel essay "Youth 18×2 Japanese Slow Train Wandering". Eighteen years ago, a backpacker from Japan, Ami (Kiwara Koya), came to the store where high school student Jimmy (Xu Guanghan) worked. The two spent the summer working together in the same store. Jimmy gradually developed a favorable impression of Ami, but Ami will return to Japan. Faced with Jimmy, who was unable to organize his mood, Ami made "an agreement"... Time passed, Jimmy, who returned to his hometown, found the postcard that Ami sent from Japan 18 years ago. Memories of his first love emerged, and Jimmy took the train to Ami's hometown and began a solo journey to Japan.
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