Born Back Ceaselessly into the Past Part 2 is the 16th chapter of Bungo Stray Dogs.
Tanizaki is dragged through the door, leaving Atsushi alone. Lucy reveals that she's an orphan like him and that if she failed her mission, she will be cast out of the Guild. Atsushi tries to use the key to open the door, but it turns out to be sentient and unusable. Atsushi is left to keep avoiding Anne, and not knowing what to do, tries to run out the exit to ask for help from the Agency. However, he's stopped by the other man who stayed in the room. The man, a former doctor, told him not to give up, since if he leaves the room he'll forget everything that happened, and that he shouldn't give up on his friends, who never gave up on him. This fires Atsushi up just as he gets caught by Anne and dragged through the door. Lucy thought she had succeeded, but it turns out that the door that she thought was closed was actually an illusion done by Tanizaki when he was dragged in, and that Atsushi was holding onto the door frame with his bare strength. He also reveals that he tied a ribbon around her waist and pulls her to him, telling her to deactivate her ability or he'll drag her into the room, where no one, not even her, can get out. Lucy hesitates, but finally releases her ability. After everyone's out, she runs away, while Kyouka runs up to greet him. He thanks the man from before for giving him advice, and is shocked to see Kyouka terrified when she sees the man. The man, who has found his Elise, is revealed to actually be the Mafia boss Ougai Mori. He heads to a warehouse, where a large group of Mafia members are surrounding the dead body of the Guild member who had accompanied Fitzgerald to the Agency. Chuya tells Mori that he was an assassin, and he says that no matter who the enemy is, they must be thoroughly crushed and killed.