"Years after the war between the Children of Water and the Children of Fire, Oceanus, a god of the sea, presents Prince Sirius with the eye of Algarock, thereby putting him in charge of those that dwell under the waves. But when Sirius encounters a beautiful Fire Child named Malta (the daughter of the Queen of Fire), he is lost in love and defies the law that states that Children of Water and Children of Fire must forever remain separate to prevent war from breaking out once more. Sirius and Malta struggle to be together while running into obstacles. But in the end, are the echoes of history too loud to overcome or can the two lovers be united and bring peace to the land?"
IMDB review (Average rating: 9.1): Beautifully animated fairytale masterpiece
8 September 2000, Author: Bruce Whitten (StlBlade)
I saw this on either HBO or Showtime in the early 80's (As the legend of Sirius) and was entranced by it. The story is a retelling of Romeo and Juliette, though with a happier ending (Not a difficult feat). It also reminds me greatly (especially Ursula) of Disney's 'The Little Mermaid', though that came much later (And wasn't as good). The final battle between Posideon and 'Ursula' (A very different beast that I can't remember the actual name of) is better than Disney's offering, including the animation.
Our hero Sirius, a water child, falls in love with Marta, a fire child. In the english translation, they were Prince and Princess, respectively though that doesn't affect the storyline much. Friends are lost, and other sacrifices are made in the name of true love, then....well, can't give away the ending.