When Princess Weier was 14 years old, she fell in love with the prince of the human kingdom. However, the prince already had a fiancée and loved her very much. However, the prince's fiancée fell in love with another person. So the little mermaid secretly looked at the prince from time to time, but the prince didn't know. Until her 15th birthday, the little mermaid asked her mother if there was anything she could transform into a human being. Her mother told her a story about a little princess from the previous generation. That story was the daughter of the sea in Andersen's fairy tale. And what choice will the little princess make? Stay tuned…