Gaiden Chapter 4.4

Ministry of Justice / Morning / Sunny ④ (司法省本館／朝／晴天 ④,) is the fourth part of the 4th chapter of the Bungo Stray Dogs Gaiden manga.

Summary
Under Ayatsuji's watchful eyes, the Justice Ministry scours for the CCTV footage and awaits the appearance of the culprit behind the elevator fall. Meanwhile, Asukai asks Tsujimura about her job in the Special Division for Unusual Powers; being two years in her profession, he asks whether she finds it scary with Ayatsuji, dubbed as the "Cold-blooded God of Death". He wonders whether she volunteered to be Ayatsuji's supervisor out of her desire for revenge, but she quickly denies it. In the end, Tsujimura asserts her confidence in Ayatsuji's ability despite everyone's warning to her about its dangers.

Specifically, Another ensures the accidental death of a guilty party who killed or attempted to kill whether an investigation commission is cancelled or pushes through till the end. With an ability absolute like a god, one failure from Ayatsuji will get him disposed by the Special Division, hence likening him to be walking on a tightrope. In essence, Ayatsuji's loss lies in failing to find the murderer, while Kyōgoku loses once a piece of evidence that points to him is uncovered.

Ayatsuji suddenly bursts in anger upon finding out from the CCTV footage that the culprit is the Engineer himself, who has a partially-cut ring finger and the 18th person from the Reigo Island massacre. In other words, the Engineer is being manipulated by Kyōgoku but has possibly no idea he is being controlled. Looking further into the footage, they find the Engineer carrying six cartridges turn into four cartridges after the elevator fall, which they notice to cause the elevator's steam explosion.

Tsujimura wonders whether the four cartridges are spare, but Ayatsuji deduces that there must be a reason to use the other four. Soon realizing the next possible incident, Ayatsuji instructs Asukai to head to the nearest buildings within six kilometers that have card verification in elevators, as he believes the Engineer shall kill once more using the remaining cartridges.

Asukai deploys his team, while Tsujimura volunteers to participate in the operation as well. However, Ayatsuji merely asks her to wait, reminding her that her job is to supervise him rather than arrest criminals. Tsujimura insists on finding the Engineer, their remaining lead to the Reigo Island massacre. Hence, Ayatsuji strikes a deal with Tsujimura to do anything for him in exchange for accepting her request. Tsujimura agrees to their deal and immediately fetches a car.

Asukai asks Ayatsuji if he is entirely sure of letting Tsujimura get involved with the Engineer, fearing that she might end up getting blinded by revenge on him, but Ayatsuji remains unbothered. He then clarifies that the one Tsujimura needs to exact revenge on is not the Engineer but Ayatsuji himself, since her mother was one of the Reigo Island murderers and was therefore killed off by Ayatsuji's ability.

Abilities

 * Another (mentioned)
 * Possession Drop (alluded)