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Koji Saeki (佐伯 浩二 Saeki Kōji) is one of Hikaru Shindo's friends from Morishita Sensei's study groups and a 4 dan who is noted by Waya to support himself by playing go.
Appearance[]
Personality[]
History[]
Plot[]
Insei Arc[]
Pro Exam Arc[]
Koji was among a team of professionals who Hikaru meets.
Sai vs Meijin Arc[]
Koji helped Hikaru understand the rules of his game with Touya.