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Summary
The deal is simple: one life for another.
The Port Mafia wants Dazai Osamu back.
Mori calls it an exchange.
Dazai calls it a mistake.
As the past closes in and the line between ally and enemy blurs, the Agency begins to realize the truth—
The “Demon Prodigy” never really disappeared.
And getting him back might cost more than anyone is prepared to pay.
Marked T for swearing, and canon typical violence/dark themes.
Manga Spoilers through to the end of Part 1
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Armed Detective Agency, Port Mafia, and Special Division React to Dazai Osamu's Past by Umbrella_Girl_Creates
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs
03 May 2026
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Summary
Four groups compete to get the reality-changing book. it just so happens Dazai gets to it first. As he tries to erase the book, he ends up creating a singularity. The same singularity BEAST! Dazai made, and now to escape an endless white room the groups must watch Dazai's dark past.
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I can't cope with the sad backstory I wrote as the fanfic "The Demon Prodigy-Origin". To process it I'm writing the reactions of people in order to not become depressed!Demon Prodigy-Origin is my original work. Do not repost or adapt without permission from Umbrella_Girl_Creates.
- Language:
- English
- Words:
- 430,492
- Chapters:
- 48/?
- Comments:
- 1,665
- Kudos:
- 1,953
- Bookmarks:
- 276
- Hits:
- 82,126
Bookmarked by A_Crow_With_Books
05 Aug 2025
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Everything’s Going Just As Planned by bxdysnxtchers4ever
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs, 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
26 May 2026
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Mori Ougai had worked hard to earn his position as head of the Port Mafia, and he ruled with absolute authority. And, like any other who wielded absolute power, he was not someone to take an affront lightly. He was even less inclined to forgive and forget when the affront was committed by a spandex-clad man who claimed to fight for peace above all else. So, when he found himself dangling by the collar at the hands of Japan’s Number One Idiot during what should have been a routine meeting, he couldn’t help but laugh.
Finally. Something he could work with.
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Chuuya had done a lot of batshit crazy things in his life–he’d taken out entire rival gangs with just Dazai at his side, he’d been betrayed by the people closest to him, and he’d even risen to be one of the most influential members of the Port Mafia before he even turned 16. But nothing could have prepared him for his next mission. A pro-hero? UA student? Him? And that bandaged freak was going to? What has the world come to?
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Or Mori is attacked, so Soukoku is forced to go to UA, and Dazai wields emoticons like verbal nukes
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Updated irregularly
(12/12/2025) Updating chapters 3/14 finished- Language:
- English
- Words:
- 213,222
- Chapters:
- 28/?
- Comments:
- 1,036
- Kudos:
- 3,465
- Bookmarks:
- 593
- Hits:
- 111,066
Bookmarked by A_Crow_With_Books
29 Sep 2024
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Summary
There was a new member at the agency, Dazai Osamu. As he co-workers and boss get to know him, different emotions and thoughts appear in their mind. Later, the other people join the agency, and they too can't help but observe this man.
A series of one shots centred around the ADA members and Dazai Osamu
Previously titled Yosano Akiko on Dazai Osamu
As of 23/02/23 there is a russian translation of this fic here: https://ficbook.net/readfic/13205000
- Language:
- English
- Words:
- 76,568
- Chapters:
- 8/8
- Collections:
- 1
- Comments:
- 190
- Kudos:
- 2,319
- Bookmarks:
- 506
- Hits:
- 49,443
Bookmarked by A_Crow_With_Books
18 Sep 2024
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A collection of stories for an au where Fukuzawa and Mori are married and foster/adopt almost everyone.
Bookmarked by A_Crow_With_Books
09 Sep 2024
