Because of a certain incident, Sado Tarou learns that there is a problem with his body. He derives pleasure from girls doing "this" and "that" to him. To cure his body, and so that he can confess to his love...

Lucia is the new girl at school. She and her sister run a public bath that's all the rage. When Lucia meets a terrific-looking surfer boy, there's just one little problem: Lucia is a mermaid-not just any mer...