Twins Thor and Rai finds themselves abandoned on the hostile planet of Chimaera after the murder of their parents.

According to the rules of the planet, Thor must become engaged to Tiz, a member of the Sun Ring who saved him.

Thor goes in search of a hermit who may have some valuable information. During his search he runs into Chen and enters into a formal duel for Tiz's freedom.

Thor finds out surprising details of his family's history from the hermit Colin and has a shocking revelation about his own future.

Thor is manipulated into a duel to the death with the Ochre Ring's Top. With Thor outmatched, Third comes up with a plan to help even the odds.

Thor discovers the Blanc Ring is on the move and investigates their leader who seems to be bent on annihilation.