Lieutenant General Seigo Yamazawa of the Imperial Japanese Army accompanies John Watson on his mission within Tokyo to locate and destroy Victor Frankenstein's research notes, known as The Memorandum. Yamazawa brings a military background marked by excellent training and skilled swordsmanship. He reveals that The Memorandum is held by the Osato Chemical company and leads the group to its location. During their approach, the group encounters an attack by advanced corpses; Yamazawa confronts armored samurai corpses alongside Frederick Burnaby. The Lieutenant General possesses notably large eyebrows. His involvement in the narrative concludes following these Tokyo events.