Aesher, son of the Sea God, devotes himself to mastering hydrokinesis. Before coming ashore, he journeys to the Gilded Royal City in search of his mother. After rescuing his younger sister, the princess, he enters the palace with her.
His royal brother mistakes him for an ordinary man with no divine powers, while even his own mother dares not acknowledge him amid the kingdom’s wartime crisis. When an undead army launches a massive invasion, everyone’s water magic proves useless. Aesher’s spectacular abilities amaze the entire court, yet his brother Ide remains consumed by jealousy.
The undead witch secretly manipulates Ide, abducts the queen and other members of the royal family, and lays a deadly trap. At the critical moment, Aesher awakens the power of his sea-god bloodline. Poseidon, his father, crosses countless dangers to reach him. United by the strength of family, they slay the Lich King, pacify the ancient evil spirits, and restore peace to the royal city. In the end, the family is finally reunited.