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 of defeating the famed Go prodigy Akira Toya!

In Hikaru no Go, Vol. 12: Sai's Day Out, Hikaru's career as a professional Go player begins. In his first game, he must face veteran player Toya Meijin, Akira's father. The match is not just a competition but also a personal challenge for Sai. As Sai attempts to teach a cheating Go player a lesson he'll never forget, the question arises: will Hikaru's ghostly master do him proud or make him look like an amateur?