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Yukito Kunisaki (Hikaru Midorikawa), a traveling puppeteer, arrives in a small sea-side town in the hopes of earning money at the upcoming summer festival. At the same time Misuzu Kamio (Tomoko Kawakami) is just leaving school after discussing her summer project with one of her teachers. Choosing to do a project on the history of the town, Misuzu finds a book containing the story of Kannabi no Mikoto(Chinami Nishimura), the inspiration for the upcoming festival. After crashing her bike and encountering Yukito on the beach, Misuzu invites Yukito to stay at her home until the festival begins after learning that he has no place to stay. After meeting Misuzu's eccentric aunt Haruko(Aya Hisakawa), and getting a hangover the next morning from drinking with her, Yukito accompanies Misuzu throughout the town as she does research for her project.

As the two become closer, the story of Kannabi no Mikoto, or Kanna for short, begins to unfold, telling how Kanna, the last of the winged beings, fell in love with her guardian Ryūya (Nobutoshi Canna) while being sequestered in a palace under penalty of death if she attempted to leave. As the two eventually become lovers, Kanna reveals her desire to escape and use her wings to fly to her mother, whom she was separated at birth from. Eventually, Ryūya decides to help Kanna see her dream and the two plot their escape.