When Hikaru Shindou discovers an old go board in his grandfather's attic, he is greeted by the spirit of an ancient go master, Fujiwara no Sai. Sai spent his life teaching the techniques of the board game to an emperor during the Heian era, and now in his ghostly state, he is eager to share his passion with the unsuspecting Hikaru. The only problem is that Hikaru is not all that interested in board games. But Sai is not easily dissuaded. Pressured by Sai's unrelenting desire to pursue something he refers to as the "Divine Move," Hikaru begrudgingly consents to playing the game, executing moves as dictated by Sai. But slowly, intrigued by the dedication of his peers, he begins to learn the basics of the game.

As Hikaru enters into the world of go, guided by his intangible tutor and inspired by his rival, Akira Touya, he cannot help but be drawn into the complex game as he grows determined to prove his own abilities.