After the Koka region fell under the control of Hideyoshi TOYOTOMI from Nobunaga ODA, the Koga warriors were mainly missioned to spy on Ieyasu TOKUGAWA.
その後、甲賀の地が織田信長を経て豊臣秀吉の支配下に入ると、甲賀武士達は徳川家康の監視活動を主な任務に命じられる。