A new king of the dragon race who has just succeeded to the throne is faced with the extinction of the dragon race. The only way to keep the dragon race alive is to find the mermaid's secret treasure again, as they were told by their former king. A harmless and cute girl, on the surface, she is a princess who is loved by everyone. In fact, it seems that her origins are a secret. The story of an extraordinary king and princess, each with their own hidden secrets .