Voice actress: Kei Mizusawa

Shūyu Kōkin

Leading strategist of Go and close friend of Sonsaku. A central figure of Go, she combines military strength with political astuteness.
A realist, she considers all matters from the perspectives of "reason" and "long-term benefit."
She can use the tactic "Flame of Shūyu" to trigger a conflagration in front of the enemy.