Five hundred years prior to the events of Saiyuki, a heretical child with golden eyes is brought to Heaven. He is placed under the reluctant care of a minor deity named Konzen, who is the nephew of the Merciful Goddess Kanzeon Bosatsu. Konzen eventually names the child "Goku." Goku befriends two other minor gods, Marshal Tenpou and General Kenren of Heaven's Western Army. He also encounters a strange little boy who appears to be his own age, the War Prince Nataku. Although Goku is happy in his new home, Heaven is not kind to heretics. There are those who would use Nataku and Goku as tools in an attempt to seize the throne of Heaven, and Konzen, Tenpou, and Kenren may not be able to save them.