Police Chief Tanaka possesses awareness of the secret 8-Man project. His history with Hazama Itsuru involves conflict, recalling Hazama killing seven people—including three corrupt officers—and pursuing Tony Glek. This past creates significant tension when circumstances compel Tanaka to collaborate with Hazama again.

Following Hazama's fatal injuries and transformation into the new 8-Man, Tanaka maintains the pretense of ignorance regarding the change. He cautiously approves of Hazama's improved conduct post-transformation and inquires about a stadium incident, receiving an explanation from Dr. Tine. Despite initial animosity, Tanaka ultimately acknowledges Hazama's essential contributions to resolving a major case.

One documented action shows Tanaka retrieving a printed message concerning constitutional amendments in Japan from a printer.