Sixth grader Hikaru Shindo stumbles upon a mysterious Go board with a blood stain on it. Before he knows it he's hearing voices, one voice to be exact. The voice of an ancient Go instructor, Sai of the Fujiwara. Sai occupies a space in Hikaru's mind. Hikaru is the only one who can see, hear, or talk to Sai. Sai's one and only desire is to play Go. But he can only do that via Hikaru's body. However, Hikaru has no interest in playing Go. Will Hikaru allow Sai to play? And who is this mysterious young boy, Akira Touya?

With the recent defeat of the Meijin's son, Hikaru goes about his day normally. However, Akira is obsessing over the game he lost. He won't do anything but stare at the Go board and replay the game that he lost. When he gets word that Hikaru is at a Children's Go Tournament, he rushes there hoping to confront Hikaru and ask for a rematch.

The finals of the Third Annual Junior High Go Tournament - Kaiou Junior High V. Haze Junior High. With a score of 1-1 it is up to Hikaru to win it for Haze. Can he do it? And what will happen when Akira spots Hikaru playing?

The Go Sallon Yuki goes to doesn't mind giving him money for winning games, but they are tired of him cheating to get it. They hire a skilled player who pretends not to know anything about Go to teach Yuki a lesson. Unfortunately, Yuki falls for the trick and ends up betting 10,000 yen (about $90). Can Yuki manage to defeat this skilled player?

Hikaru let's Sai play Go online, that way nobody will think Hikaru is really good when in reality he's not.