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White, black and gray by Fork_melon_tea
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)
12 Jul 2025
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”That’s rare, school too much for the demon prodigy eh? You out of your league?” Chuuya smirks mentally filing the information away for him to give Dazai shit about later, ignoring the fact that he is probably in the same boat.
Dazai smiles tightly, looking like a disgruntled cat- a terrifying disgruntled cat, “Anyways, we can’t just ask for admission mid year.”
“Why.”
“That’s how schools work.”
“It’s dumb.”
“I know, I’m sure there’s a logical explanation for it.”
They wait, hoping the logical explanation would come soon. It doesn’t.
Or; soukoku at UA.
Working title : Dazai, chuuya, and the mortifying ordeal of finally acting their damn age.- Language:
- English
- Words:
- 64,174
- Chapters:
- 11/?
- Collections:
- 3
- Comments:
- 519
- Kudos:
- 2,646
- Bookmarks:
- 469
- Hits:
- 46,754
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Like the Holding of Hands (Like the Breaking of Glass) by Mid_archer
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)
13 Jul 2026
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Summary
The semi-sentient god that posesses Chuuya is one that Dazai's family has worshipped for centuries. Take the Mafia's most powerful duo and throw them into an undercover mission disguised as traumatized teenagers at U.A. High for aspiring heroes.
(OR: Dazai worships Arahabaki. Chuuya carries Arahabaki. "What do you mean we need to infiltrate the heroes?")
"And this pure, brutal love, like everything holy, burns the eyes of Humans who observe it, that's why they'll never see the terrible beauty of it all."
- Language:
- English
- Words:
- 47,690
- Chapters:
- 21/?
- Collections:
- 8
- Comments:
- 2,009
- Kudos:
- 7,435
- Bookmarks:
- 1,347
- Hits:
- 181,421
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Gothams Got Drama (And We’re Bringing More) by I_Am_Fictional
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs, Batman - All Media Types
16 Nov 2025
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Summary
A powerful ability user has shown up in Gotham, and the Bat family just can’t seem to catch them!
Dazai and Chuuya are sent to Gotham to stop them from wreaking havoc(more than the usual Gotham standard)
Drag queens, bats, and why do these kids all have clinical daddy issues?
Aka- Dazai and Chuuya go to Gotham and it’s like they belong
(Slow to update)
- Language:
- English
- Words:
- 78,796
- Chapters:
- 20/?
- Comments:
- 442
- Kudos:
- 1,855
- Bookmarks:
- 327
- Hits:
- 39,695
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This is Stupid; We Regret Everything by BurntOutNgl
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)
23 May 2026
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Summary
Mori sends Soukoku on a bodyguard mission with the requirements to 1. Protect class 1A and (later stated) 2. Drag out the UA traitor.
[Everything will be based on the light novels for Bungo Stray Dogs from “FIFTEEN,” to “The Day I Picked Up Dazai (Side A)”]
There is an audio reading for this fanfic on YouTube by the user @Lucia_Undergrove if anyone’s interested 🙂
Series
- Part 1 of BSD Crossovers
- Part 1 of BSD
- Language:
- English
- Words:
- 111,288
- Chapters:
- 40/?
- Collections:
- 2
- Comments:
- 401
- Kudos:
- 3,672
- Bookmarks:
- 538
- Hits:
- 120,191
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The Hidden Things by Fae_Thing
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 Jun 2025
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Taking place before Stormbringer, Chuuya and Dazai have been tasked with going to U.A. in order to gain Principal Nezu as an ally against the L.O.V - who are being pesky little shits at the border of Yokohama. While confused, annoyed, and not entirely willing to rub elbows with hero wannabes, maybe Chuuya and Dazai can finally act like kids. For a little while at least.
Or alternatively: Soukoku is being adopted by Aizawa and Present Mic as they're taught what life away from Yokohama is like. Shenanigans ensue.
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We've Crossed The Path of No Return.(Yet, I'll Always Come Back To You.) by Chuuyas_fan
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)
30 Jul 2025
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Summary
“Stupid slug, it obviously means we’re being sent to Masutafu to find out what those heroes and villains are planning.”
“…what?”
Or: Dazai and Chuuya get sent to Masutafu to infiltrate both UA High School and the League. Dazai; who’s sent to spy on UA students while also being an undercover villain. And Chuuya; a member of the League. Oh yeah, and Arahabaki’s sentient. AU CREDIT: Eni-Gxcha
Series
- Part 2 of MHA X BSD CROSSOVER
- Language:
- English
- Words:
- 49,264
- Chapters:
- 6/?
- Comments:
- 306
- Kudos:
- 1,117
- Bookmarks:
- 203
- Hits:
- 30,359
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I'm Not a Hero by The_Truth_Never_Told
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)
31 Aug 2025
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Dazai tries to commit by drowning and finds himself drifting downstream unconscious. He drifts outside of yokohama's borders where Aizawa finds him while on patrol and takes care of him, while forcing him to go to U.A where people can keep an eye on him.
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Therapy sessions and love confessions by Supercoolneicheusername
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs, My Hero Academia, BSD - Fandom, mha
12 Jul 2025
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Summary
Yokohama is closed of from the rest of society but Mori is determined to learn more, so he sends Dazai and Chuuya on a mission to the most prestigious hero school in Japan to find out more about the outside world and quirks.
Or
A story about two boys who get sent to a school they know nothing about and struggle their way through feelings, lies, romance and unwanted friendships. And what will happen when all the Lies and barriers they created start to unravel around them?
- Language:
- English
- Words:
- 40,434
- Chapters:
- 21/?
- Comments:
- 190
- Kudos:
- 1,094
- Bookmarks:
- 168
- Hits:
- 26,614
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The Sun Only Shines Brighter When You're (Not) Around by Always_Sleeepy_Headd
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)
15 Sep 2025
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Teenage Soukoku are given the task of going undercover to UA as Hero Students to keep a look out for All For One's return, however, Class 1A is a trouble magnet.
Plus, it's very hard to pretend to not know who Shitty Dazai was at school when he's so... Shitty. (And totally not handsome, nuh uh nope.)
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Heroes Dyed Black [being rewritten] [on hiatus] by RumiToons
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)
13 Sep 2025
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Summary
"This mission will be a little different from what you both are accustomed to... What do you both know about UA High School?"
"It's a hero school in Musutafu... What? Wanting to change career options, Mori-san?" Dazai speaks with as much of a bored tone as he can muster, keeping his gaze locked on the window.
"Correct Dazai! Though I'm quite comfortable in my position, a career change isn't necessary. No. I am bringing up the hero school because this mission involves you two attending said school!" A wicked grin splits across his face at the reaction of the two seated before him. ....
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Or: Dazai and Chuuya get sent to infiltrate UA highschool under Mori's orders. However one green-headed boy keeps catching Dazai's eye... Welp! What can go wrong?
Or: I wanted to try my hand at Soukoko going to UA highscool with some twists added in C:
- Language:
- English
- Words:
- 80,221
- Chapters:
- 24/?
- Comments:
- 491
- Kudos:
- 2,361
- Bookmarks:
- 350
- Hits:
- 61,457
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Think twice by Chuuya__56
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)
19 Jul 2025
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What do you both know about Musutafu?"
“A large city about a 3 hour car ride from Yokohama. The city is famous for many heroes, such as All Might's residency there, as well as the prestigious hero school known as UA High.”
“Do you both happen to know what a hero licence is?”
DISCONTINUED
- Language:
- English
- Words:
- 52,339
- Chapters:
- 36/?
- Comments:
- 313
- Kudos:
- 2,150
- Bookmarks:
- 251
- Hits:
- 54,070
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From Unexpected Places by Azulray
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs, Harry Potter - J. K. Rowling
25 Aug 2025
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Dazai had expected life after the Decay of Angels incident to go pretty smoothly. Sure, there were the bumps of the deal Fukuzawa had made with Mori and the Agency's tattered reputation— not to mention the nagging feeling he got whenever he thought of Fyodor— but it was nothing he wouldn't be able to handle with time and an unfortunate amount of effort.
That was of course before he'd received a letter from European wizarding authorities. Well, he might as well make the most of this situation and knock out some of his problems in the process. Better yet, he could drag Chuuya along for the ride.
Or: Dazai (who just so happens to be the son of a British wizard terrorist) gets into magical legal trouble. The wizarding world is not prepared.
- Language:
- English
- Words:
- 54,605
- Chapters:
- 12/?
- Collections:
- 5
- Comments:
- 388
- Kudos:
- 2,398
- Bookmarks:
- 520
- Hits:
- 45,204
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A Detective's Guide To Overthrowing The Government by Sereneabyss
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)
10 Nov 2024
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Being dragged into an unknown universe with far too black and white definitions of 'Hero' and 'Villain' is not what Atsushi would call a vacation. However, unfortunately, Dazai thought otherwise. Thus, he found himself an unwilling employee to a Café co-owned by Chuuya and Dazai, along with Akutagawa and Kyouka as his equally unwilling coworkers. And Dazai decided they are all masquerading as some sort of fucked up post adoption family? He wasn't sure why for that one.
Not to mention a chance encounter with one Midoriya Izuku would only lead to them deciding to overthrow a system that hinges on discrimination of quirkless individuals. Again, not the most ideal vacation spot.
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I don't smoke by Tinfoilhats
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)
17 Jul 2026
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“You will both be undertaking long term stealth missions elsewhere, but you won’t be operating together for the most part. Dazai, you’ve heard of UA high school right?”
“Of course I have, it’s like the most popular hero school in Japan or something. And now you’re going to tell me I have to live my dreams and become a hero," Dazai jokes.
The older man makes not a single sound, and Dazai turns to look at him, straight in the eyes. The corners of his mouth turn downwards instinctively.
“Wait. You’re serious? Ah, I might really have to jump off that bridge, after all,” He says airily, but he’s already planning out which bridge will be his best bet.
Mori sighs exasperatedly, “Dazai, you will be infiltrating UA high school and posing as a student there. You’ve already got experience in stealth training, but it will be a shame to let such a valuable executive go..”
-------------Dazai and Chuuya are sent on missions to infiltrate opposite sides of two parties that Mori has deemed a threat to the mafia, and to simply gather information from both sides. Is there more to this assignment than what they were informed of?
Spanish translation linked!
Series
- Part 1 of I don't smoke (and related works)
- Language:
- English
- Words:
- 200,358
- Chapters:
- 60/?
- Collections:
- 1
- Comments:
- 2,265
- Kudos:
- 7,501
- Bookmarks:
- 976
- Hits:
- 249,523
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The Echoes of who we used to be by 24knatzxoxo
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs, School Bus Graveyard (Webcomic)
13 Feb 2025
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Time seemed to go by slow after the sun set. Because for these few, they knew that every night could be there last.
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--------------------After taking up an oddly suspicious job, the agency and the PM find themselves in grave danger. After these missions, every night they are casted defenseless into some weird fucked up world that apparently, only let them in.
OR
Basically if bsd was in sbg.
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dazai and his group chats // a magic and mystery chatfic by dazamuu
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs, Harry Potter - J. K. Rowling
21 Jun 2026
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dazai and his lovely little group chats... what could ever happen??
takes place in the Magic and Mystery/Coil universe
[not updating anymore]
- Language:
- English
- Words:
- 40,886
- Chapters:
- 26/?
- Comments:
- 753
- Kudos:
- 2,373
- Bookmarks:
- 180
- Hits:
- 45,332
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Open For Negotiations by redbun2x
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)
12 Jan 2026
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The bill to open Yokohama—and the rest of Japan—to mutual exchange has finally passed after hundreds of years. Despite their differing worldviews, both sides agree that cooperation will bring benefits.
However, due to skepticism among many Heroes and Yokohama citizens alike, the government has proposed a test run.
Each side will send trusted members for a tour and observation.
Yokohama requested adult Heroes, as they’ll be interacting with broader society. Japan, on the other hand, requested young Ability Users who will be entering U.A.
With three major factions in Yokohama, each agreed to send two representatives, each harboring their own interests:
The Port Mafia, the Armed Detective Agency, and the Hunting Dogs—the representatives of the Special Abilities Division—have formed a temporary alliance, cooperation veiled with hidden blades and forced smiles.As for the chosen representatives?
Raise your hand if you’ve had the hellish experience of going to school.
...
Everyone: Can we just go back to Yokohama in peace?- Language:
- English
- Words:
- 120,833
- Chapters:
- 34/?
- Comments:
- 587
- Kudos:
- 3,279
- Bookmarks:
- 509
- Hits:
- 98,550
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WOLF IN SHEEP'S CLOTHING by da_foxy
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)
04 May 2025
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After waking up on a hospital bed on the other side of the border outside of Yokohama, Chuuya was offered a life changing option by a homeless looking man: become a hero to obtain benefits for him and The Sheep. Though hesitant, he agreed for the sake of The Sheep.
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Dazai was sent on a mission by Mori to infiltrate UA to gain a hero license to expand the Port Mafia business outside of Yokohama and to gain information. What he expected to be a boring mission was proven wrong when he met a fiery haired boy decimating the battlefields of the practical exam. 'Incredible...'-
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Voice by AshBride
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)
02 Apr 2025
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Several months ago, a group of Heroes rescued a troubled boy from a Port Mafia compound. Of course, that boy is actually Dazai and – whether he's actually been caught, or this is one of those times where he gets purposefully captured for reasons he hasn’t bothered to explain – it's Chuuya's job to go and get him. Which would be easier if the Heroes hadn't decided the safest place for a Port Mafia rescuee is UA. Luckily, Chuuya's just made friends with a Europole agent who's willing to bend some rules to keep Chuuya safe from the assassin who considers him family.
Now, Chuuya just has to figure out which pieces Dazai wants on the board and where, while making sure no one realises they know each other, and making sure not to get attached. What could go wrong?
or
SKK infiltrate UA but make it Stormbringer
- Language:
- English
- Words:
- 59,183
- Chapters:
- 7/?
- Collections:
- 1
- Comments:
- 221
- Kudos:
- 878
- Bookmarks:
- 195
- Hits:
- 21,249
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A Suicide's Odyssey by catavento
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)
03 Sep 2026
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During the early hours of a Saturday, Mori called him to his office under the pretext of assigning him a new job. What Dazai didn't expect was for this to be an infiltration mission at the hero school, UA, of all places.
What the hell was Mori thinking?
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Or, in other words, BSD x BNHA crossover focusing on Dazai!!
Series
- Part 1 of WIP
- Language:
- English
- Words:
- 108,752
- Chapters:
- 21/?
- Comments:
- 799
- Kudos:
- 2,591
- Bookmarks:
- 421
- Hits:
- 68,738
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