After rescuing the disaster at Firefly Castle, the three young fairies, Xiya, Haixin, and Xiafan, return to the human world of Yueyou Island and become trainee keepers at the Marine Nursery. During their internships, they learn about the ocean and actively participate in marine life rescue efforts. However, a mysterious group calling themselves the "Iron Eagle Squadron" suddenly descends upon Yueyou Island, using a variety of high-tech equipment to capture a variety of marine life. Dr. Huanzhong, a master of machine manufacturing, is behind this operation. Xiya, Haixin, and Xiafan then wield their magical powers to engage in a battle to protect marine life. source: bgm.tv\googletranslate