When the land of Koka went under control of Hideyoshi TOYOTOMI by way of Nobunaga, Koka Ninja began to be ordered a monitoring activity on Ieyasu as main mission.
甲賀の地が信長を経て豊臣秀吉の支配下に入ると、甲賀忍者達は家康の監視活動を主な任務に命じられる。