It is said to be a loose retelling of Romeo and Juliet, itself a European version of many tales of star-crossed lovers in a variety of cultures and eras.

In this story, the children of the gods of fire and water fall in love and fight to stay together in the face of adversity.

However, Argon (named Algorac in the English adaptation), Lord of the Winds, grew jealous of Glaucus and Themis's love and turned them against one another by lying to each that the other was plotting to overthrow them.

After both sides were nearly destroyed, the highest god of them all upon hearing what happened, became angry with Argon for plotting and provoking the dispute, so intervened and struck down Argon, tearing loose his eye (the source of his power), and damned him to the deepest abyss of the oceans, entrusting the eye to Glaucus and keeping the seas calm.

Years later, Sirius (named Syrius in the English adaptation), Glaucus's Most Loyal Warrior, becomes heir to the Sea Kingdom and is given the Eye of Argon to protect.

Princess Malta, the daughter of Themis, also becomes the new heir to the Fire Kingdom, being charged with guarding the Holy Flame at the edge of the sea each night until her sixteenth birthday, when she will become queen.

As Sirius plays with his little brother Teak (named Bibble in the English adaptation), he wanders off into the forbidden waters of the Sea Kingdom.

Malta returns to the Holy Flame, accompanied by her friend Piale, but becomes agitated as she worries that the strange boy - or one of the monsters from the sea that her mother has warned her about - will appear.

As the sun begins to rise, however, Sirius must return to the sea, because the children of the water will die if they are touched by sunlight.

After asking Moelle (named Aristurtle in the English adaptation), the oldest and wisest sea turtle in the ocean, for some advice, Sirius is advised to forget about Malta.

Moelle tells them the story of how water and fire no longer lived together as one, but when he's done, he sees Malta and Sirius embracing, surviving the amount of heat from the nearby flame.

During the same eclipse where Malta is to be made queen, strange pink flowers of fire and water known as Klaesco blossoms (called Kalea flowers in the English adaptation), on Mobius Hill (called the Hill of Elysium in the English adaptation), burst into bloom and release white spores that fly up into the sky, making their way to that star.

As she sobs on his shoulder, Piale, who had been watching the whole time, promises to distract everyone while Malta and Sirius escape to Mobius Hill.

When they fly down from the palace to see it, the Queen discovers Piale's sacrifice and sends the Fire Children to bring back Malta.

Teak doesn't like this plan but thinking he has no choice goes to tell Sirius, unaware of Mabuse's true intentions to finally take the eye for himself.

Sirius desperately searches for Malta on land but falls off a cliff and loses his sight when he hits the ground.

In an epilogue, Moelle appears saying that fire and water now live again in peace on this planet, but he passes on the story of Malta and Sirius, and how they now watch over the world from their own star in the night sky.