The thief wants riches. The knight wants revenge. The warrior wants a good battle. The sorcerer wants power. Each adventurer carries a mysterious crystal sphere that will lead to a long-hidden secret beneath the sea. After the thief, Halia, discovers a crystal sphere magically protected in a crumbling castle, she meets three others with spheres of their own. Arwold, the knight, bears one on the hilt of his sword. The sorcerer, Ahriman, who has owned his sphere for some time, enlists the warrior, Xarun, to steal another one from the peaceful Arboreals. With the help of an elementalist and his apprentices, the four set off on a quest to discover the fifth and final sphere. Along the way, they must battle demons, dragons, and sometimes one another. And they have no idea what the spheres have planned for them at the end of the journey.