Hime Koi Mermaid

A girl named Himeka has a crush on Kaito, who enjoys the ocean, while she cannot swim. One day, she watches him in the water when he suddenly drowns. Himeka saves him using a magical spell that transforms her into a mermaid after a sea witch named Myuu appears. The spell causes her to turn into a mermaid whenever she gets wet. The story explores whether Himeka can change back to her original form and how this affects her feelings for Kaito.