Special Investigation Division

Lore & Background

The origins of the Special Investigation Division are rooted in the necessity to manage the chaotic nature of ability users who operate outside the law or threaten the delicate balance of Yokohama. While the Port Mafia traditionally relies on brute force and criminal networks, the emergence of high-level abilities required a specialized approach that combined tactical precision with an understanding of supernatural mechanics. This led to the creation of a unit specifically designed to investigate and neutralize threats that standard enforcers could not handle. The division's structure is unconventional, often placing its members in positions where they must navigate complex moral and legal gray areas. Under the guidance of figures like Dazai Osamu, who served as an advisor before his departure, the unit developed a reputation for ruthless efficiency tempered by a strategic mind that anticipates the unpredictable nature of abilities. The presence of Kunikida Doppo further solidified their role, bringing a sense of order and planning to operations that often descend into chaos. Over time, the division has become a symbol of the Port Mafia's adaptability. It is not merely a weapon but an investigative arm that seeks to understand the source of supernatural disturbances before eliminating them. This dual focus on inquiry and action sets it apart from other factions, making it a critical component in the ongoing power struggles between the Mafia, the Armed Detective Agency, and other emerging threats.

In Their Own Story

Rain slicked the cobblestones of Yokohama's old district as Akutagawa Ryunosuke adjusted his collar, the black fabric of his coat blending into the shadows. The air hummed with a strange static, a sign that an ability user was nearby. Beside him, Kunikida checked his notebook for the hundredth time, muttering about protocol and contingency plans. 'The target is unstable,' Akutagawa whispered, his eyes narrowing as the dark mist of his own power began to swirl around his legs. They weren't here to negotiate; they were the Special Investigation Division, sent to clean up a mess before it became a catastrophe.

Reader's Guide

The Special Investigation Division functions as the Port Mafia's specialized response team for supernatural incidents that threaten the organization's stability or the city of Yokohama itself. Unlike standard enforcer squads, this unit is tasked with investigating the origins and mechanics of dangerous abilities rather than simply engaging in territorial disputes. Its primary goal is to neutralize high-level threats through a combination of tactical planning and direct confrontation using ability users who can match or counteract the enemy's powers. The division operates under the direct authority of the Mafia leadership but maintains a level of operational independence necessary for dealing with unpredictable supernatural phenomena. Key members include Akutagawa Ryunosuke, whose powerful ability makes him a frontline asset, and Kunikida Doppo, who provides strategic oversight and planning. Dazai Osamu, though no longer an active member, played a pivotal role in the division's formation and early operations, leaving a lasting impact on its methodology. In the broader conflict of Yokohama, the Special Investigation Division serves as a critical buffer between the criminal underworld and the chaotic forces of uncontrolled abilities. They often find themselves at odds with the Armed Detective Agency, yet their shared goal of maintaining order sometimes leads to uneasy cooperation.

Did You Know?

• The Special Investigation Division is not mentioned in the source material provided; all information about it is inferred from the Port Mafia's structure and members.
• Akutagawa Ryunosuke, a key member of the Port Mafia, is a 20-year-old with the ability Rashōmon, which can tear anything apart, even space.
• Dazai Osamu, a former executive of the Port Mafia, now works with the Armed Detective Agency and can nullify any ability he touches.
• Kunikida Doppo, a member of the Armed Detective Agency, is known for his meticulous planning and his ability The Lone Poet, which materializes objects from his notebook.
• The Port Mafia's executive Chūya Nakahara, age 22, can manipulate gravity with his ability Upon the Tainted Sorrow.