Kurojaki is the leader of Koga ninja dogs. He's a vicious cannibal dog who uses a scythe as his weapon. He ambushes Akame when he Gin and the Igas come to his teritory to gather the healing herbs. He wounds Akame in the neck with his scythe. Gin attacks kurojaki and makes him lose his left eye by his own weapon.

When Kogas fight against Ou army, they are interrupted by Wilson, who throws Kurojaki's son off a cliff as a revenge for killing Wilson's familly. Outraged Kurojaki attacks the Ou dogs untill he's defeated by Gin. He runs away to commit suicide in the burning house of Iga.