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Synopsis

Following Sara's ultimate sacrifice to stay beside Gaito, the ocean realm has settled into a fragile peace maintained by six mermaid princesses. Caren, Noel, and Coco have resumed their duties at their own courts, leaving Lucia, Hanon, and Rina to prepare for similar returns. Complications arise as Mitsuki Tarou departs for Germany and Doumoto Kaito plans a trip to Hawaii, events that leave Lucia emotionally strained. The situation grows darker when Kaito disappears at sea, and an enigmatic angel named Michel arrives, urging the mermaids to accompany him. Amid these trials, the spirit of Sara appears to Lucia and reveals the identity of her intended successor: a young mermaid called Seira. The group must confront loss, separation, and supernatural entreaties as they embark on a new chapter.