Minami no Jewel

Hisui used to live on Kohaku Island, where she lived by the ocean and loved life. However, she's changing schools and thus has to leave her best friend, Kairi the dolphin, behind... It's at that time, Hisui meets the swim team's hot Minato by chance...! Could this be a blooming love for the attractive boy, or a replacement for her dolphin Kairi?