Chapter 91

Back to the Detective Agency (我等再ビ探偵ノ舎ニテ,) is the 91st chapter of the Bungo Stray Dogs manga.

Summary
Atsushi and Kyōka convene with the other Agency members, including Kunikida, with his limbs restored; Ranpo, who has requested Poe to recreate the Agency office using his ability; Yosano; and the President. When Atsushi notices that Tanizaki and Kenji are still missing, Kyōka detects some intruders with them. She activates Demon Snow to stab through the table, under which Tanizaki and Kenji are hiding, apparently planning to surprise them.

Tanizaki and Kenji explain that when the Mafia had arranged a hideout for them in a deserted village, they were invited back to return with the rest of the Agency by Mori himself. Ranpo deduces that the Mafia boss may have judged the Agency's strategy to be of utmost importance with the world's fate technically depending on it, more so because the source of the vampire outbreak began in the Mafia, which might probably be currently in shambles as well.

Fukuzawa initiates the meeting and has Ranpo explain the present conditions. The great detective briefs them that the five Decay of Angels members have finally launched their last stage of spreading infectious vampires throughout the world using Bram's ability, which has finally sunken 16 armies. Turned troops have also been acting silently amidst remaining panic-stricken nations, who are oblivious to how many vampires lurk within their armies. Fukuzawa notes that Bram is formerly deemed as one of the ten calamities to destroy the world who was defeated and sealed with the Holy Sword by Fukuchi, though he presumes that such deed is part of his scheme.

As the vampires easily slip into the ranks of soldiers who do not know who is a vampire, it has caused friendly fires out of suspicion and fear. Tanizaki assumes that this tactic must be a precedent to the enemy's objective to lead the world into chaos, but Ranpo corrects him that their true aim is "One Order": a mind-controlling ability weapon created during the Great War and one of the three great disasters sealed away. Meanwhile, in the South Pole, One Order is finally authenticated to be released from its containment.

To explain how One Order works, Ranpo asks the Agency how many bullets it would take for a soldier to kill one enemy on the battlefield. After they throw in their guesses, Ranpo cites that 50,000 bullets are statistically listed to be used by troops to pretend fighting and miss their targets, since they would not wish to see themselves killing someone with their shots. Despite people not being made for the battlefield after all, One Order was developed as a "humane" tool to protect soldiers from war.

Fukuzawa explains that One Order works similar to his ability, All Men Are Equal, which makes every subordinate act exactly as ordered. When used, the target moves like the superior's extension and absolutely carries out orders, clearing the soldier of doubt and guilt in executing their superior's orders. Supposedly a kind weapon, it was soon sealed away by the governments due to its potential danger that can trigger coups d'état. Tanizaki notices that it was merely "sealed away" and not destroyed, the latter sentiment Ranpo believes should have been done.

He asks what they think should One Order be used by Fukuchi, to which Kunikida responds with horror after realizing that Fukuchi's subordinates would be the Humankind Army—in other words, the entire world. As such, Ranpo deduces the Decay of Angels' final objective to be world domination. Within 20 hours, Fukuchi will receive One Order at the airport, so Ranpo readies them to avert it at all costs and prepares to explain his strategy.

Abilities

 * Black Cat in the Rue Morgue (setting)
 * Demon Snow
 * Infection-Type Ability (cameo)
 * All Men Are Equal (mentioned)

Chapter Notes

 * The major members of the Agency convene back together. Tanizaki and Kenji return with Mori's aid.
 * The vampire infection outbreak is reported to have sunken 16 armies throughout the world.
 * One Order is finally released from its containment. Its ability is also revealed and explained.
 * It is slated to be delivered to Fukuchi within 20 hours, which the Agency plans to intercept and stop.