Six-year-old Nora Vale has had an inexplicable connection with the ocean since she was a child. As an infant, the water around her would flow on its own, even condensing into the shape of a whale. After she turned three, she began to hear voices from the sea. At six, during a school visit to a marine rescue center, she formed a mental connection with a blue whale named Blue. When classmates bullied her, Blue suddenly went berserk, and at the same time all the fish in the marine rescue center gathered toward Nora's location. For the first time, everyone realized that this child was not ordinary. Nora's mother, Elena Vale, has always concealed her own past. She can manipulate water and was once an experimental subject of a secret research project called the "Tideborn Project" during her childhood. The project's director, Dr. Warren Voss, is her father. Elena escaped the research facility back then and thought she could leave the past behind, but she never expected that Nora would possess abilities far beyond hers—she does not merely control water, but can hear the ocean, perceive marine life, and even make seawater respond to her on its own. After Blue is secretly relocated, Nora begins to constantly feel its pain. At the same time, the mysterious organization once again targets Nora, and the family is forced to flee.
