Ushio is a freediver with strange powers. He and his friends are at a tropical land in search of a rare fish, the Blue Butterfly. This pursuit leads them to Ayuuru, a local girl who might know where to find the legendary fish.<br><br>
(Source: Anime News Network)

 Kanazuki Sara, an elementary school student, meets Ushio Hayama, a boy who is an excellent swimmer, on the coast of Izu. He has the ability to attract fish. However, after being involved in an accident during a typhoon, he loses his mysterious ability along with his memories from before the accident, and has since moved to Tokyo.
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Eight years later, the two meet by chance on the high school campus. However, Ushio now has a fear of water and has lost his memories.

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