Kazuo Wakashika serves as an analyst within the Kura organization, delving into the enigmatic "wells"—simulated mental landscapes mirroring the unconscious realms of serial killers. His role centers on interpreting data extracted from these psychological constructs to guide criminal investigations. Notably, he formulated the theory that John Walker, a recurring entity within multiple killers' wells, operates as an active agent within Kura itself, signaling an internal threat. This hypothesis fuels broader inquiries into Walker’s influence over serial killers’ psychologies and actions.