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〜
Two mermaid sisters, Marin and Urin, desire to explore the land. After discovering a ring that has ended up in the ocean, they decide to go to land in order to return it to the high school girl who owns it.
