Leon Imeldas Poseidus, sixth son of the king of the seas Poseidon suffers from a terrible illness: boredom. As his engagement to a childhood friend approaches, he decides to go have fun on the surface one last time, only to be caught in a terrible storm and find himself trapped on land. He is rescued by a man, a terrestrial, and for Léon it is love at first sight, he has only one desire, to catch him and keep him for himself.