Saeki Kouji One of Morishita student. "Forced" by Morishita to defeat Ashiwara.

Sai - see Fujiwara Sai

Sakurano Chieko Kyuseikai woman Go Pro. She was also one of those who visited China. Very weak against Isumi, often called Isumi "Shin-chan".

Seiji - see Ogata Seiji

Shindo Heihachi Hikaru's grandfather. Sai was lurking in grandpa's Go board before meeting Hikaru. Grandpa was very happy to know Hikaru is playing Go and rewarded him a Go board. First Appearance: Volume 1, Chapter 1

Shindo Hikaru - More Details The main character of the series, who was possessed by Sai. Through Sai and Akira, Hikaru began to like and learn Go. First Appearance: Volume 1, Chapter 1

Shin-ichi - see Murakami Shin-ichi

Shin-ichiro - see Isumi Shin-ichiro

Shinoda Insei Shihan The instructor of the Insei. He is also the person who tested Insei test.

Shirakawa Michio One of Morishita students. He was also one of the teacher in the Go class that Hikaru first visited. First Appearance: Volume 1, Chapter 1

Suyon - see Hon Suyon