Kokubo Sumigaoka (墨ヶ丘 黒母, Sumigaoka Kokubo) is the ninth retainer of the Yanari Shogunate.
He was commonly known as the Owari Savage.
A man with a stern look on his face.
He tried to explain the pointlessness of war to Shichika Yasuri, but fails to do so.
Swordsmanship Specialist: He wields Outō Nokogiri.