Chapter 15

Constantly Pushed to the Past, Part 1 (たえまなく過去へ押し戻されながら（前編）,) is the 15th chapter of the Bungo Stray Dogs manga.

Summary
Dazai has returned to the Agency, and from him Atsushi learns that the ones hunting him are the Guild, a group of North American ability users with a tremendous amount of capital. The leader of the Guild, Fitzgerald, shows up with two of the Guild members to ask Fukuzawa to sell the Agency to him, but he refuses. Fitzgerald threatens that the Agency members will disappear if he doesn't agree. The next day, it's discovered that Kenji has gone missing after escorting the Guild, and that a building housing the offices of the Port Mafia has vanished. Atsushi, Tanizaki, and Naomi set out to find Kenji, but Naomi also mysteriously disappears and they get trapped in a strange room created by Guild member Lucy Maud Montgomery using her ability. The only exit is through a door, but that will cause you to lose all memories of the room. Most of the civilians trapped along with the Agency flee through that door, but Atsushi, Tanizaki, and a man looking for a missing girl named Elise remain in order to find their missing companions. Lucy explains that if they manage to open the door their friends are trapped behind before a giant doll named Anne catches them, they'll win. Right after the game starts, Tanizaki is immediately caught by Anne and dragged through the door.

Trivia

 * The title refers to the final line in The Great Gatsby, a book written by Francis Scott Key Fitzgerald.