Summary
The whole thing happened when a boy who likes to imagine started to saying that he saw a mermaid but it is actually a fish. The boy kept saying that he saw a mermaid so he got arrested and had many torture to fix his mind but he did not stop believing. He maneged to escape but he found out that what he was saying mermaid was actually a fish and at that moment, police men surrounded him to capture him. Then suddenly the fish turned into mermaid and boy himself also turned into mermaid and they went swimming into the sea.
Message
Director of this animation, Tezuka Osamu has experienced war and I think that this is an irony to government at that time: the time when it was wrong to think differently and citizens thought was limited.
Ending
I think the last scene when the two mermaid swims away, was the sight of someone and the others saw the boy laying down with a fish. The one who saw the two mermaid will say that he saw it and the story will be repeated.
