Hime Koi Mermaid

Kaito, who Himeka has a secret crush on, loves the sea, unlike Himeka who can't swim! One day, Himeka was watching Kaito swimming and playing as usual when he drowned! Himeka was somehow able to save Kaito with the help of a magic spell that turns her into a mermaid after the sea witch Myuu suddenly appeared. However, she becomes a mermaid every time she gets wet! Will Himeka be able to return to her original body? What will become of her love with Kaito?

(Source: Shogakukan, translated)

Note: Includes two extra chapters.