Saheiji holds the position of police detective in Edo under the Tokugawa shogunate, managing investigative operations despite precarious health that confines him to frequent bed rest. His physical frailty restricts direct fieldwork, compelling dependence on subordinates like Sabu—his daughter Midori’s fiancé—to execute arrests and collect evidence. This familial bond with Sabu merges personal and professional spheres, shaping their collaborative dynamic.

Tasked with authorizing arrests and overseeing bureaucratic procedures, Saheiji delegates active pursuits to Sabu and Ichi, a blind swordsman ally. Immobility contrasts sharply with his authoritative command, casting him as a strategic orchestrator of justice who directs operations from a stationary yet influential post. His role remains central to administrative governance, balancing vulnerability with unwavering oversight of Edo’s law enforcement endeavors.