As human beings Hai Xin and Xia Fan, by chance, they obtained the magical energy they had been dreaming of and, with the consent of the demon fairy Xiya, became the little demon fairy. Together with Xiya, they guarded the human world and the magical ocean. While helping Xiya investigate the sea beasts that polluted the magical ocean, they strengthened Prince Haida and his companions in Haiying Castle
As human beings Hai Xin and Xia Fan, by chance, they obtained the magical energy they had been dreaming of and, with the consent of the demon fairy Xiya, became the little demon fairy. Together with Xiya, they guarded the human world and the magical ocean. While helping Xiya investigate the sea beasts that polluted the magical ocean, they strengthened Prince Haida and his companions in Haiying Castle