In the beginning, a boy helps a fish and the fish turns into a mermaid.
They spend a lot of time together and enjoy.
The boy liked the mermaid so much that he took her home.
When he talked to his parents about the mermaid, his parents couldn't understand.
They sent him to the governmental place where he is treated badly.
When he is released, he get to see the mermaid again and he himself becomes a mermaid.
