1 - 20 of 113 Works in Class 1-A (My Hero Academia) & Dazai Osamu (Bungou Stray Dogs)
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Dazai Met Chuuya First and then Aizawa by iwas_Rivat
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)
06 Sep 2025
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Summary
Dazai never attempted suicide when he was 14 years old. Therefore, he never met Mori Ougai, nor did he join the port mafia. Instead, he encountered Chuuya which will eventualy lead them both to leave Yokohama to try and become heroes in Musutafu.
In other words, Dazai's story changed a lot and add MHA to that.
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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)
04 Sep 2025
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Irregular updates (11/4/2024)
Shortened title (4/11/2025)Mori was not a man to take an affront lightly, especially when the affront was committed by a man wearing spandex who lacked the mental faculties to comprehend that even the head of the mafia could engage in above-board business dealings. So, when he found himself dangling by the collar at the hands of a man who practically glowed, he couldn’t help but let out a bitter, mirthless laugh to cover up the ice-cold rage that consumed him. Thinking only of revenge, he carefully planned his next move.
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Chuuya had done a lot of batshit crazy things in his life--he’s taken out entire rival gangs with just Dazai at his side, he’s 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, and I mean nothing, could have prepared him for his next mission. A pro-hero? UA student? Him? And that bandaged freak was going to? The demon prodigy? Are you freaking kidding me right now?
Or Mori is attacked, so soukoku is forced to go to UA
In which Dazai can say emoticons out loud.
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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)
03 Sep 2025
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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 🙂
Updates the first week of every month
Series
- Part 1 of BSD Crossovers
- Part 1 of BSD
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To The Other Side And Back (But Not Really) by MixstyRqin
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)
01 Sep 2025
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Midoriya Izuku had been different his entire life. After a series of events he decided to take a former friends advice, leading to an encounter that changes the direction of his life and his identity. Years later, he is sent back to where he grew up to complete a mission alongside his new partner, Nakahara Chuuya.
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I'm shit at summaries. Basically Midoriya runs away, becomes Dazai, Then is forced to go to U.A. for a mission with Chuuya. (The first 3 chapters are just backstory basically)
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I don’t want to be here anymore by Zai_0123
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 Aug 2025
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Mori sends dazai to UA to sniff out the traitor and sends Chuuya to the lov to find out there plans.everything start great until dazai mother decides to pay UA a visit.
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(Don't) Root for the Anti-hero by Tsukasaiscat
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), 文豪ストレイドッグス | Bungou Stray Dogs
24 Aug 2025
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"Mori, sir," said a short ginger teenager, knocking on a wide doorway, "you called for us?"
"Yes, yes." The boss waved halfheartedly for the boys to take a seat.
"Chuuya, Dazai,"
The tall, lanky teenager to the left of Chuuya rolled his eyes.
"Soukoku has a mission."
Series
- Part 1 of unfinished works (hiatus)
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Kismet by tu1ipzlvr
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 Aug 2025
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Dazai has always been bad with feelings.
After joining the Armed Detective Agency, he finds himself in a whole new light, navigating complicated emotions and expressing vulnerability as he gets more comfortable. Suddenly, the Agency strikes a deal with the Port Mafia—to transfer one member from the light to the dark, in exchange for protection during the battle against the Hunting Dogs. When all of that is over, it’s time for Mori to choose who will join the Port Mafia’s ranks. Upon hearing Mori’s final decision, Dazai is forced to deal with this new revelation.
Around the same time, there has been an increase in the number of heroes trying to break through the barrier between Yokohama and the rest of Japan. The new member in the PM’s ranks is forced to go on a long-term mission with the strongest ability user, Chuuya Nakahara. With the both being over the age required to go undercover as a student at U.A High, one of them becomes a teacher at the esteemed UA under the careful watch of Principal Nedzu as the other infiltrates the ranks of the LOV.
Fate binds people to things—so what will happen when Double Black is reunited and forced to work together by the string of kismet once again?
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When our stars we loose by Oana011
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), 文豪ストレイドッグス | Bungou Stray Dogs
21 Aug 2025
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Dazai will go to the UA to serve as a bodyguard.He will protect and befriend the students.And later on, investigate them
But he does not want to leave without his dear Chuuya.Mori is normal and like a dad to Dazai.
Mori and Fukuzawa are still in contact.
Chuuya will not attend the school.English is not my first language, if I have any mistakes, please let me know.
If someone wants to be a beta reader, also let me know. -
A Suicide's Odyssey by catavento, ch3rryx
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 Aug 2025
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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!!
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A hundred broken hearts by Angelskisss
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)
14 Aug 2025
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Three knocks were heard on the other side of a black metal door. They were neither too fast nor too slow, not too quite not too loud. Small anxious foot taps were also heard, although perhaps not to the people of the room, but to the owner of the knocks. The gravity manipulator, Nakahara Chuuya.
"Come in." Taking a deep breath Chuuya walked into the office he dreaded every single day. The cold atmosphere made chills go down his spine. The windows made him wonder how long would he fall out of them before being crushed to death by gravity. The single desk made him uneasy. The person behind it, even more.
or: Chuuya and Dazai are sent on a mission to U.A.
I swear it's not as bad as it looks
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THE WOLF AFTER HEROES by We_Both_Know_Something_Is_Wrong
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)
14 Aug 2025
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The port mafia, better known as the ^ villains ^ of Yokohama had declared war between the heroes 13 years ago. The heroes always thought that the war was going to be easy because they were more compared to the port mafia (heroes of Japan: 48k+, The port mafia: 25k+). Nonetheless the port mafia got something that the heroes didn't know. Ability users.
No one outside of Yokohama knew what ability users were or how powerful they were, thanks to the war their conclusion was that ability users were 10 times stronger than a normal quirk. Why? because they can use it when they want without feeling tired or anguished. Also, the fact that it is more rare to see an ability user, the ability comes from the soul. Not by genetics, that’s why, even if two ability users have a child doesn’t change that the child might or not might have an ability. But if the child has an ability the most possible thing to happen is that it might be a completely different ability compared to the parents.
13 years later after the war. The port mafia won, and took control over all Yokohama, building a very thick and large wall around it.
The new boss, Mori Ougai. Told one of his subordinates something… What might it be? -
You cut yourself because it represents the people that you've hurt by Anonymous_Eggz
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)
14 Aug 2025
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"You're here because, to be quite frank, rumours are circulating and I'd rather they didn't." Nezu paused, concern painting his features (fakefakefakefakefakefake) as he spoke. "There have been whispers about a rising villain organisation. Normally, I wouldn't be all that concerned, but one of the members...let's just say I'm concerned. For reasons I won't state, you're here to protect and defend Class 1-A for as long as I deem necessary, and by extension the rest of the school."
Dazai hummed, leaning onto Chuuya's shoulder. The fact he didn't get pushed off made him grin. The ginger just sighed, rubbing his nose bridge.
"So we're here to babysit brats for an undetermined amount of time?"
Dazai pat him on the head. "Yep!"
Or:
Nezu and Mori have way too much sexual tension and no one is pleased, Dazai and Chuuya remember that they're teenagers and Aizawa needs coffee: the fic
Or Or:
Dazai needs therapy and is dragging down everyone else so they do as well
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Español - When we're together (I'm not afraid of my tears) by LaTraductora_00
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)
08 Aug 2025
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El Internet es una herramienta poderosa, las noticias se propagan rápidamente por todo el mundo, a veces más rápido de lo que se pueden eliminar. Entonces, ¿qué pasa cuando comienza una transmisión en vivo desde la infame ciudad de Yokohama? ¿Qué pasa cuando dos adolescentes ejecutan sin piedad a un héroe profesional para servir de advertencia al mundo exterior frente a una cámara?
Lo que pasa es una demanda abrumadora de detener a estos chicos y hacer justicia, sin embargo, un astuto director tiene otra idea en mente...
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O bien, Dazai y Chuuya se ven obligados a asistir a UA.
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Trying My Best (I’ve Never Been A Spy Before Though) by Chrysslu
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)
07 Aug 2025
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To catch one spy, you’re going to need at least four others.
Maybe that’s not very subtle of both the agency and Port Mafia, but their trying their best.Kyouka has never been to high school before, but here she is, about to go to a school for heroes. But she’s not at UA to learn: she’s here to unearth a traitor hiding somewhere in the school.
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The Shades of Neutrals by nyami_tofu
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 Aug 2025
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"Dazai-kun, Chuuya-kun, a new mission for you. This will be an infiltration mission outside of Yokohama. Don't disappoint me!"
Dazai and Chuuya leave the boss's office after receiving the file containing information on their new mission.
"These so-called heroes have been overstepping their boundaries. They've been getting bolder these days, "saving" the citizens of Yokohama." Chuuya says in disdain and anger. There's no way these heroes thought kidnapping these poor citizens meant that they were saving them from the rumored "villain's ruling".
The heroes have been invading Yokohama, time to send Soukoku in to show these heroes their places!
Series
- Part 1 of Monochrome World
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Two genius demons in UA for reasons by zeroBraincells9
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), 文豪ストレイドッグス | Bungou Stray Dogs
04 Aug 2025
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This is a Fyodor and Dazai go to UA fic, cause there's not enough of these. BTW Yokohama is more or less closed off from heroes and others like that, I know it's general for these but I have no motivation and it's my first fic...
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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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“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
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Clap, Snap, Boom! by INFINITYIDK
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 Jul 2025
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Reputations lead to rumours, and rumours have a tendency to run free. So when rumours of the infamous Double Black reach the Pro Heroes, the organization of the shadows is in the eyes of the light.
So now the Pros Focus is on the big bad mafia. But if they were to focus on reforming Double Black, then the situation would be put in Double Black’s control.
And it would be disgusting to not save these orphans? Who had no guide in the world, who were forced and manipulated by evil men to be heartless killers by a brutal, unforgiving world?
I mean- have I mentioned they don’t have parents?
_+-*-+_Or: Double Black is put into a villain reformation program at UA as its first unwilling participants. (Though they have more control than UA thinks.)
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Some good detectives (MHA X BSD) by 3X0RS1SM
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)
24 Jul 2025
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The famous mafia executives know as double black are sent on a mission by the port mafia boss. Their job is to infiltrate UA, a prestigious high school in Mustafu. Because Q has been rotting away in their cell for the past 2 years, they are allowed on the mission as well (and because my fav they/them does not get enough attention). The ADA overheard what the PM were going to do and wanted in. After a few meetings the PM succumbed, since the Triparte Pact obliged them to, and Ranpo was now on the mission as well. Q, Ranpo and Soukoku will infiltrate class 1A. Unfortunately, Q hasn't been in the outside world long enough to understand basis social manners. Q's behaviour, Ranpo's intellect and Dazai's typical jokes about suicide arouse suspicion form the teachers, especially their homeroom teacher, Shouta Aizawa. Will they finish this mission and leave Mustafu without any trace, or will they get caught up in friendships and feelings ?
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Dazai, Chuuya, Q, and Ranpo infiltrate UAI do not allow my work to be posted anywhere else, the only version of this fis is on ao3 under the user 3X0RS1SM. If you want to do something with my work please reach out to me.
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Stray's in a Hero’s World by Luna_bloodmoon
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 Jul 2025
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Dazai Osamu, the Demon Prodigy of the Port Mafia, finds himself thrown into an unfamiliar world after being hit by a mysterious ability during a mission with Chuuya. Injured and half-dead, he collapses on the doorstep of Pro Hero Aizawa Shouta.
Series
- Part 2 of Lost in the alternative Universe