Records Hall · Yokohama Collective
Curated Fan Theories
Community-sourced plot theories, character studies, and ability analysis gathered into the Lore desk.
Comprehensive theory arguing Fyodor orchestrated his own death, secretly collaborating with Nikolai all along. Evidence includes the helicopter scene, Sigma's information exchange, and the convenient positioning of events. If Fyodor predicted Dazai's moves inside Meursault, he predicted what came after.
Theory that Fyodor symbolizes a type of fallen angel, connected to the very source of abilities. Supported by references in the "Untold Origin of the Detective Agency" light novel. His goal to eradicate abilities may stem from intimate knowledge of their origin and guilt over his role in creating them.
Popular theory that Naomi Tanizaki doesn't exist as a real person but is instead a manifestation created by Tanizaki's Light Snow ability. Her behavioral inconsistencies, unusual relationship dynamics, and the fact that she has no confirmed ability of her own all support the idea that she is a permanent illusion.
Theory that Atsushi was written into existence by the Book, similar to Sigma. His mysterious parentage, the orphanage headmaster's cryptic warnings, and his inexplicable connection to major events all point to an origin that is literary rather than biological.
Detailed analysis of why Higuchi likely has an unrevealed powerful ability and deeper connections to Mori Ogai. Based on real-author relationships, Mori's unusual tolerance of her behavior, and Asagiri's confirmation that she possesses an ability. The question is not whether she has power, but what Mori is waiting to deploy.
Theory that Dazai and Fyodor met during the years after Dazai left the Port Mafia but before joining the Agency. Their familiarity, mutual respect, and the specificity of their chess-like rivalry suggest a history beyond what has been shown on screen.
Theory that Tanizaki will be the Agency member transferred to the Port Mafia as part of Fukuzawa and Mori's deal. His illusion ability would make him the "perfect assassin," and his protective nature toward Naomi could be leveraged as motivation.
The DoA's goal is actually the opposite of destruction—it is purification. Fukuchi seeks a world without abilities, seeing them as humanity's curse. The angel motif from season 4 and the group's name itself point to a philosophy of cleansing decay rather than causing it.
Theory that Ranpo and Fyodor have been adversaries longer than anyone knows, and it will be Ranpo's deduction—not combat—that finally unravels Fyodor's plans. The world's greatest detective versus the world's greatest criminal, settled not by power but by intellect.
Theory that the Dazai from the BEAST alternate universe and the main timeline Dazai are the same individual who used the Book to create a reality where Odasaku lives. Not a parallel—a choice. He wrote a world where his friend survives, knowing he would not exist in it the same way.