Plot: It is a story about a boy who loves imagining things. One day, he finds a fish swimming in a pond but the fish suddenly turns in to a mermaid. The boy took her home and put her in a tank and showed her to the boy's parents but his parents see a fish swimming in the tank. An organization takes the boy away and tries to teach him that it is a fish not a mermaid by torturing him. Although he was tortured, he still believed that it was a mermaid. So the organization educated him and finally he couldn't remember how the mermaid looked like.
Ending: At last he forgot how the mermaid looked like and takes the fish back to the pond. Being chased by the organization, he killed himself and he was able to see the mermaid again.
Message: I think at the time Osamu Tezuka made this story, the government sometimes brainwashed people's mind to make it easier for the government to manipulate people. Also, because Tezuka was creative and had a different way of thinking, he may have experienced the struggles of getting someone to understand him.
