In his grandfather's attic, Hikaru Shindou uncovers an ancient go board that triggers a mysterious encounter with the spirit of Fujiwara no Sai, a skilled go player from the past. Sai, driven by an unfulfilled quest to master a divine go technique, enlists Hikaru as his conduit to play the game once more. Reluctant at first, Hikaru embarks on this unexpected journey, guided by Sai's expertise. It is through facing off against the talented Akira Touya that Hikaru's dormant passion for go awakens, setting the stage for a thrilling exploration into the world of this ancient game.