Gaiden Chapter 4.7

Justice Ministry Main Building / Morning / Sunny ⑦ (司法省本館／朝／晴天 ⑦,) is the seventh part of the 4th chapter of the Bungo Stray Dogs Gaiden manga.

Summary
Upon the Engineer's inquiry, Ayatsuji tells him his deduction of narrowing down his location, given away by his taunt seen from the CCTV footage, his planned misdirection of destroying other elevators in the Justice Ministry building, his psychology, and his motive for mass murder, hence leading Ayatsuji to conjecture that the Engineer would be targeting the station to derail the train. As such, they have contacted the railway company to freeze operations. The Engineer then recognizes Ayatsuji as the Homicide Detective, who humors that the Engineer seems like a chatterbox unlike Kyōgoku.

Ayatsuji turns to the agents and officers to prevent them from opening the Engineer's bag, as his ability might activate and kill him once they find out incriminating evidence inside, more so because of Ayatsuji's certainty of the Engineer's guilt. He then asks Tsujimura to make her arrest, but the Engineer pulls out another explosive as a threat. Tsujimura urges the Engineer to drop his explosive, while he demands them to prepare him a runaway vehicle in exchange.

Stuck in an impasse, Tsujimura asks the Engineer whether he remembers the Reigo Island massacre, where her mother was convicted among the 17 victims. The Engineer turns amused at Tsujimura's relation to a murderer, while Tsujimura bids him to tell the truth about her mother's exact involvement in the incident. If she truly fouled her hands, Tsujimura avows to discard her mother; if she was simply being controlled by the Engineer, Tsujimura would have to take her revenge on Ayatsuji.

The Engineer provokes Tsujimura, recounting a woman she resembles whom he recalled had been burned to death, hinting it to be her mother. He also lets on that he might have suggestively manipulated Tsujimura's mother like the countless others he controlled, much to Tsujimura's rage. With the latter maintaining her gunpoint at the Engineer, Ayatsuji warns her not to fall for his words. An unseen individual then muses how troublesome Tsujimura would so easily destroy the evidence before them.

Characters in Order of Appearance

 * Yukito Ayatsuji
 * Mizuki Tsujimura
 * Engineer
 * Asukai
 * Natsuhiko Kyōgoku (mentioned)
 * Yoshino
 * Tsujimura's Mother (flashback)

Abilities

 * Another (mentioned)