Hanzo appeared as the main character in the setting that even after the Hanzo-Hattori clan had been punished by Kaieki (forfeit rank of Samurai and properties), the Iga shogunate spy group and its leader, Hanzo HATTORI, were still active in the dark side of the world.
服部半蔵家の改易後、服部半蔵を名乗る頭領とその配下の伊賀忍軍が影の世界で活躍していたという設定で、半蔵が主人公として登場する。