Yukito Kunisaki, a traveling puppeteer, arrives in a quiet seaside town searching for a girl connected to the sky — a quest inherited from his mother. He meets Misuzu Kamio, a lonely high schooler who dreams of flying and eagerly pulls him into her daily life. As Yukito gets to know Misuzu and her guardian aunt Haruko, Misuzu's recurring episodes of pain whenever she forms close bonds reveal that her longing for the sky carries a cost neither of them expected.