Baron Eiichi Shibusawa is a prominent industrialist and key figure in the early 20th-century Tokyo Improvement Project. He wields significant influence in governmental and economic spheres, driven by the goal of transforming Tokyo into a modern, prosperous capital. Recognizing the threat supernatural forces pose to the city, he actively seeks counsel from spiritual experts, specifically commissioning onmyoji Yasumasa Hirai of the Tsuchimikado clan for guidance on safeguarding Tokyo spiritually and countering antagonist Yasunori Kato's destructive plans.

Following the devastation of the 1923 Great Kantō earthquake, Shibusawa oversees Tokyo's reconstruction. He champions ambitious infrastructure projects, including Japan's first subway system. To achieve this, he appoints physicist Torahiko Terada to manage subway construction and later enlists feng shui master Shigemaru Kuroda to investigate and mitigate further supernatural disturbances endangering the rebuilding process.

Primarily a facilitator and authority figure, Shibusawa leverages his resources and connections to mobilize both conventional and mystical defenses for the city. His actions consistently support his role as a protector of Tokyo's modernization ambitions against existential threats. Rooted in his historical persona as a pivotal industrialist in Japan's economic development, this depiction presents him as a supporting character driving the human institutional response to the central supernatural conflict.