A young piano prodigy, Yuri Kashiwagi, returns to her hometown after several years and joins a middle school to mentor the choir group.

In a small fishing village, a gloomy middle school student named Kai meets a mermaid named Lu.

Sasaki Ryohei (Yamada Ryosuke), the second son of the Sasaki family, is a high school student who lives in Shimane. He has just been chosen to be the...