Kokona feels isolated by her mother's heavy work schedule, leading her to spend time reflecting on her childhood. While looking through an old scrapbook, Hinata and Aoi discover a mysterious acorn that triggers a flood of forgotten memories. As autumn settles in, these shared recollections bring the three friends face-to-face with promises they once made to each other. Revisiting their past helps them realize how much their bond has changed while teaching them to value both old connections and…
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