Fuyuto Kyogoku, a detective based in Kabukicho’s Pipe Cat Bar, maintains a reserved exterior and rigid moral code rooted in a traumatic past. His psyche fractured after confronting the Jack the Ripper case, which revealed both the killer’s identity and their intimate ties to him, plunging him into a catatonic state. Sherlock’s unorthodox intervention—using shock tactics like smearing animal waste on him—jolts Kyogoku back to reality, though emotional detachment lingers as a scar.

A methodical thinker, Kyogoku dissects crime scenes with precision, uncovering overlooked discrepancies. His analysis of a suspect’s framed alibi proves instrumental in resolving a pivotal case, showcasing his deductive synergy with Sherlock. Personal history intertwines with his professional pursuits when Maki Hokari, his romantic interest, is unmasked as Jack the Ripper. Witnessing her brutality and demise deepens his trauma, leaving fractures in his emotional resolve.

Interactions with fellow detectives expose his pragmatic worldview. He candidly frames their alliances as transactional, emphasizing self-interest over camaraderie—a stance illustrated when he notes the group’s reluctance to aid Sherlock without Watson’s personal plea.

The OVA episodes juxtapose his solemnity with absurdity, such as cross-dressing under duress for a covert operation. These comedic intrusions highlight his reluctant adaptability within the team’s chaotic dynamics.

Kyogoku’s arc traces a halting journey toward reclaiming his role in investigations, though shadows of his ordeal persist. The narrative anchors his evolution in present interactions and case-driven challenges, leaving his backstory beyond trauma and profession deliberately unexplored.