In the year 3099, Earth is on the verge of returning to its origins as the water planet Ethanos, when Prince Elijon, a young Mermadian Prince, endures a tragedy that engenders him to flee his watery home. On land, Elijon avoids his past and immerses himself in the human world, making friends and falling for a girl named Rachel Montgomery. But war is brewing beneath the waves and Prince Elijon will soon be threatened by a battle for the throne over Ethanos, and the war above, to save mankind.