Everyone in town believes that mermaids are not real and only appear in fairy tales and comic books. But they don't know that. There is a beautiful mermaid in the vast ocean. That mermaid is you.

But they don't even look at that ocean, except for a guy named Sugawara Koushi. He is a person who enjoys rowing in the ocean. One day, his was rowing a boat when suddenly the boat turned over and he fell into the ocean.