The leader of the Dark Moon Circus, Zirconia is actually the personification of Queen Nehelenia's own nightmares, released to vent those nightmares elsewhere.
Taking advantage of a total eclipse over Tokyo, he and an advance group of Remlus [Lemure] invade the city and begin Nehelenia's plan for revenge.
His primary mission is to locate Pegasus, who somehow managed to escape from Nehelenia's dimension and came to Earth, hiding in some beautiful dream. He calls upon his best men, the Amazon Trio, to search for Pegasus.
What makes the mission rough for Zirconia is that looking for Pegasus is like looking for a needle in a haystack...without a magnet.