Much of the storyline revolves around the revelations of an ancient prophecy concerning the Stars, which relate to the seven stars in the Big Dipper constellation, being given human form at a time of crisis for humanity. Although all seven of the Stars are superhuman fighters, two of them are known as the Noble Spirits, and according to destiny will fight each other to take control of the Empire. As the various Stars identities are revealed, they appear to ally themselves to either Keiro (whose star is Tonrou) or Taitou (whose star is Hagun). Because of the cruelty of the previous rulers of the Empire, and many corrupt officials still in power, Keiro has chosen to act with the prophecy and try to become Emperor himself. Taitou, although briefly considering this, ultimately rejects the prophecy entirely, choosing to forge his own destiny.