Chapter 100

At the Portway to the Sky, Part 9 (空ノ港二テ 其の玖,) is the 100th chapter of the Bungo Stray Dogs manga.

Summary
Atsushi accepts Teruko's previous condition and decides to bring her to Ranpo. He then communicates with the latter and arranges a rendezvous at Runway 122R with Ranpo and the President, after which Teruko eagerly assigns Atsushi as her transportation, much to his chagrin. As Atsushi carries her on his back, he asks her to cooperate by calling off the attack by her fellow Hunting Dogs on the Agency. Teruko states that she could only manage to contact Tetchō, specifying that she is not aware of Jōno's location.

Atsushi then recalls Ranpo having deduced Jōno to have been defeated and taken by vampires, which in turn would make it appear like the Agency's doing. He finds a contradiction for Teruko to have said that "Jōno is missing" when it should supposedly be under the impression of Jōno having been abducted by the Agency. She merely dismisses it as a deduction error, but Atsushi asserts that Ranpo never commits such a thing. Teruko ends up admitting how difficult her situation is when she has always been making others confess their own lies, confusing Atsushi. At the last moment, he sees through her, albeit too late, as he receives a quick attack with her steel whip. As he realizes that she could not break away from being controlled, Teruko chokes and de-ages him into a child.

Meanwhile, Tetchō continues his onslaught against Kenji in their brawl and proves to be quite a challenge to the young detective. Tetchō claims that Jōno is easily misunderstood, as he himself knows him as a hero who despises violence and protects the weak. Landing a fatal blow on Kenji, he gives him a last chance to tell him where Jōno is, but he receives no response.

Teruko soon radios and informs Tetchō that she has captured an Agency member. As she aims to torture him for information, Teruko instructs him to prevent anyone from interfering. With Kenji hearing how his comrade would be tortured, Tetchō opines how he can no longer save said subordinate. Kenji suddenly grows an ominous change in aura as noticed by Tetchō and avows to help out his fellow Agency member. Tetchō asks how he can do so, only for him to receive an overwhelming and unexpected kick from Kenji.

Abilities

 * Infection-Type Ability (flashback)
 * Beast Beneath the Moonlight
 * Gasp of the Soul
 * Undefeated by the Rain

Trivia

 * During the original release of the chapter, Young Ace included a 2022 calendar to celebrate the release of the series' 100th chapter.
 * To commemorate the series' 100th chapter, congratulatory illustrations by Neco Kanai, of the Wan! manga; Shiwasu Hoshikawa, mangaka of the BEAST manga; Oyoyo, mangaka of the Gaiden manga; and Ganjii, mangaka of the DEAD APPLE manga; as well as messages from, director of the anime series; , screenwriter of the anime series; Nobuhiro Arai, character design and animation director of the anime series; and Norihito Nakayashiki, director of the stage plays, were included in the chapter's original release.