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!

The Hokuto Cup games are about to begin, and Hikaru gets caught up in some misunderstandings that make it difficult for him to concentrate on go. In the first match between Japan and China he starts out poorly and seems well on the way to a resounding defeat. Only by getting a grip on himself can he possibly make a showing, but that's far easier said than done!