Back in Autumn 1999, Fu Sawatari meets Maon at the top of a hill after hearing her read out a story she is writing. When an incident between Kaoru and Norie, who also arrive at the top of the hill, causes everyone to start crying, Maon manages to calm everyone down with her whistling. After Fu returns to her father, Maon is able to come up with an ending to her story. Ten years later, Maon, who is now in middle school but is having trouble making friends, encounters Norie, who became depressed after a boy rejected her offer of sweets. As the two discuss their ambitions, they find something nostalgic about Maon's whistling and they become friends.