Goro Domoto (堂本 五郎 Dōmoto Gorō?) is Sannoh's coach, and the youngest high school basketball coach shown in the series. It is not revealed how long he has been Sannoh's coach, but under his leadership, Sannoh has continued to maintain its dominance of high school basketball. Like Riki Takato of Kainan, Domoto also has a tough training regimen, which has motivated his key players such as Sawakita and Masashi Kawata to have previously skipped sessions.
Despite Sannoh's legendary reputation, Domoto does not rest on his laurels and yearly reiterates to his players that no team is guaranteed to win a match. This carries over to the preparations he makes for the match against Shohoku even though they are ranked low as a C in comparison to Sannoh's AA ranking. He has his players watch some game footage of Shohoku and has his current team play some of his former players who are now basketball stars in college and comprise the current all star team, while wearing jersey numbers corresponding to their Shohoku counterparts to simulate the upcoming match. Domoto remains cool and collected during the Shohoku-Sannoh match, and only makes two mistakes that end up costing Sannoh the match. The first of these is matching up Mikio Kawata with Sakuragi, who emerges from this match up with more confidence and determination in himself. The second is underestimating Sakuragi's drive to win the game in its final seconds and discounting him as a result of his injury. Domoto thus does not call a timeout that he intended to take.