Umi Monogatari: Minna Aishiteru!
うみものがたり～みんな愛してる！
Source
Ocean Story
Umi Monogatari ~Anata ga Ite Kureta Koto~· うみものがたり ～あなたがいてくれたコト～
manga
63
56
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The series’ 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. (Source: Manga-Updates)