In a small fishing village called Eldraine, there is an ancient legend: the sea god Orpheus lives in a mysterious kingdom in the deep sea. Every year on the night of the summer solstice, he comes to the world to listen to the devout sacrifices and bestow a bountiful catch of fish on the villagers. The villagers have guarded this belief for generations, and every summer solstice, they hold a grand ceremony to pray for peace and abundance. However, this year's ceremony was different due to a sudden storm.

While fishing at sea, young fisherman Kyle is caught in a storm. His boat is capsized by the waves and Kyle sinks into the deep sea. Just when he thinks he is going to die, the sea god Orpheus appears and rescues him. When Kyle wakes up, he finds himself in a mysterious underwater palace. Orpheus tells him that the storm was not a natural phenomenon, but was caused by an evil force in the deep sea, which intended to destroy the peaceful coexistence between humans and the ocean. In order to save his homeland, Kyle must go to the depths of the ocean to find the ancient artifact that has been sealed and awaken the power of the sleeping sea god. Under the guidance of Orpheus, Kyle embarks on a dangerous adventure. In the end, he not only defeats the evil force, but also re-establishes the harmony between humans and the ocean.