After stumbling across a haunted go board, Hikaru Shindo discovers that the spirit of a master player named Fujiwara-no-Sai has taken up residence in his consciousness. Sai awakens in Hikaru an untapped genius for the game, and soon the schoolboy is chasing his own dream--defeating the famed go prodigy Akira Toya!

Since Sai's disappearance, Hikaru has given up go! Meanwhile, undefeated by his failure to pass the pro test, Isumi plays his heart out in China. His foreign training teaches him unique ways to handle the stress of mental challenges and competition. Upon his return, he asks Hikaru for a rematch! But how good will Hikaru's game be after such a long break--and without Sai...?