is a Japanese manga series written and illustrated by Natsumi Itsuki. The manga was first serialized in Hakusensha's monthly shōjo manga magazine, LaLa in December 1993. Several chapters of the series were serialized in Hakusensha's other bi-monthly shōjo manga magazine, Melody. The chapters released were then collected into five tankōbon volumes and later re-released into three kanzenban volumes. It was licensed and released in English in North America by Tokyopop, with translations by Yuya Otake and English adaptation by Clint Bickham. An 11-episode anime adaptation was animated by Bones and premiered on April 13, 2006 in Japan as part of Fuji TV's Noitamina programming block. On May 2, 2009, the series made its North American television debut on the Funimation Channel. The series deals with the adventures of twins Thor and Rai, who live on space colony Juno, a planet resembling earth, until they are abandoned and sent to Chimaera, a secret planet dominated by extreme weather patterns which is used as a penal colony. Plot Three hundred and fifty years have passed since humans first settled the Balkan star system, located approximately 150 light years from Earth, where a number of planets have been terraformed to resemble Earth. Two 11-year-old twins, Thor and Rai, live on the space colony Juno until they come home to find their parents have been murdered. The unknown assassins drop Thor and Rai on Chimaera, a secret planet used as a penal colony. Thor learns about Chimaeran society's four "Rings" and how to leave Chimaera by becoming the Beast King from Zagi, who rescued Thor and Rai after they immediately run into trouble on the planet. Thor proceeds to the Ochre Ring where he gets swept up into that Ring's politics and winds up defeating its Top, bringing him closer to becoming the Beast King. After several years Thor faces off with Zagi who has violently taken over the Blanc ring and is determined to rule over and change Chimaeran society. Their encounter ends with an uneasy truce and a plan to force Juno to negotiate with Thor. When Thor finally meets Odin, the President of Juno, the mystery of Thor's and Chimaera's secret origins are revealed. Odin tells Thor he is a genetically engineered human created from the DNA of all the previous Beast Kings. His mother Eve was the lead researcher at the facility where he was created, and was a surrogate