The series&rsquo; story centers on Marin and Urin, two mermaid sisters that long to visit terra firma. When the sisters find a ring that has fallen into the sea, they decide to venture onto land to return the ring to its high school girl owner.<br><br>
(Source: Manga-Updates)

Marin and her sister Urin live in the sea. One day they find a ring fallen into the sea. They get out of the sea and meet a girl Kanon, the owner of the ring. Kanon tells them she doesn't want the ring anymore because it was given by her boyfriend whom she just broke up with, and she throws it into the forest. Marin thinks Kanon is still in love with him and looks for the ring with her sister. But Urin accidentally breaks a seal near a shrine...

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