Dorian, a high school boy who is upset about switching schools due to his mother’s job, escapes to the beach one evening, where he’s entranced by a mysterious woman playing a piano. When she leads him into the ocean with an enticing song, he’s dragged unconscious into an underwater world. From here, the journey begins. But here’s the catch: he has thalassophobia. Waking up in a strange, majestic city where he’s mistaken for the new king, Dorian must find his way to Poseidon with the help of an unlikely group of sea-dwellers to return home.