They were the Port Mafia's deadliest weapon-Soukoku, the fearsome Double Black. Two fifteen-year-old executives bound by blood, violence, and an obsession so complete it terrified everyone around them. When their boss attempts to sacrifice them for political gain, Chuuya Nakahara and Dazai Osamu make an impossible choice: kill him and escape over the Barrier into hero society. But leaving Yokohama doesn't mean leaving their past behind. Now trapped in UA High School, they must navigate a world of heroes who can never understand what they've survived. Chuuya's possessive protectiveness borders on violence-he'll destroy anyone who threatens Dazai. Dazai's suicidal tendencies and manipulative genius make him both brilliant and dangerous. Together, they're codependent, obsessive, and utterly devoted to each other above all else. As the Port Mafia hunts them and hero society demands they become something they're not, Chuuya and Dazai must decide: can two weapons forged in darkness learn to protect instead of destroy? Can their obsessive love become something more than survival? And when forced to choose between their past and their future, will they burn the world down to stay together? A tale of tactical genius, brutal efficiency, possessive devotion, and two boys who love each other enough to become monsters-or heroes-depending on who's asking. "You're mine. I'm yours. Everything else is negotiable." CONTENT WARNING: Violence, references to child abuse, suicidal ideation, murder, unhealthy codependency, possessive behavior, organized crime, trauma, mature themes. INSPIRATION & CREDITS This story was inspired by the fanfiction "Cascade of Colors; I See Right Through You" by Helpmepsimsolost. Bungo Stray Dogs characters (Chuuya Nakahara, Dazai Osamu, Port Mafia, etc.) created by Kafka Asagiri and Sango Harukawa. My Hero Academia characters and settings created by Kōhei Horikoshi

Chuuya dies after use corruption and Dazai doesn't save him. But why did he reborns as a girl?! Oh, and he has a twin sister named Ochako now.

80% of the population has quirks 15% are quirkless 5% are ability-users . . . Yokohama isolated themselves since quirks appeared. When heroes emerged, all they felt was annoyance. . . . "There's nothing for you to save here, Heroes" "Heroes are nothing but cowards that wear spandexs" "Welcome to Yokohama, Students" Bungo Stray Dogs by: Kafka Asagiri Owari no Seraph by: Takaya Kagami Boku No Hero Academia by: Kohei Horikoshi I own nothing but my OC and some arts (will be stated) Cover is drawn by me. I apologize in advance for any grammatical errors and criticisms are accepted, but please avoid being rude. This is my first Fanfic and I'm not a very good writer.

"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! This is posted in ao3 as well :))

Dazai and Chuuya find themselves in a predicament. With little time to process Mori's betrayal, the two boys run to the outskirts of Yokohama city. Working together while soaked in blood, they climb the city's impenetrable barrier in a desperate attempt to survive this ordeal and start a new life. Their new life, now filled with a world of heroes and villains. The two boys now living in this new world under the guardianship of a homeless-looking man and a blond with an annoyingly flashy appearance and loud voice. What will become of these two tragedy-stricken boys and their newfound home? Will they heal from their trauma and become heros? Will their budding romance bear fruit? This is my first fanfiction and my first time writing something publicly like this( sorry if it sucks). This is a fan-fiction cross-mix with Bungo Stray Dogs and My Hero Academia being in the same universe. The characters may not act canonically, In this story, Dazai and Chuuya are both 15 and still in the port mafia. In this world, ability users were prosecuted in society so they had to seal themselves in Yokohama city, allowing no one to enter or leave. While on the outside world, quirks had developed and the existence of ability users became forgotten with the rise of heroes and villains. The citizens of Yokohama are aware of what is going on in the outside world but think it's stupid to label someone as good or evil. No, that is not my original idea and I got heavy Inspiration from "This Boys Too Young to be Singing the Blues", By Distonail. It's an amazing read, I recommend it. :) Ps. If you wanna skip to when they start making their way to MHA then skip to chapter 6 ;) though you will be missing some shipping material and plot lines if you do ;b #gore #Dazai x Chuuya X Arahabaki # Eraser-head x Present Mic #Soukoko in UA

Welcome to an MHA x BSD crossover fan fiction where I make characters in BSD, more specifically Chuuya and Dazai, op. (As if they're not already too op)

Chuuya Nakahara got into an argument with his partner, Osamu Dazai. Now, he's riding his motorbike through Yokohama as a way to cool off. But when he swerves off of the road to avoid hitting two pedestrians and gets knocked out, he wakes up to see two Pro heroes in his hospital room. Chuuya then has to attend a prestigious school despite hardly being able to read, figure out how to get back to the Port Mafia, to apologise to Dazai, and why this old hobo wants to adopt him so badly. Basically me giving Chuuya a "normal" teen experience, and Dazai suffers for later angst <3 cross posted on ao3 on the user aoibb :3 - but it is on private to avoid access of ai and bots

when 2 of the top agents in the port mafia and ADA come together to go to the world of MHA, how long can they hold out their true identities until they're found out, and what's going to happen when they do get found out.

«- ... I can't believe you made me join your Agency thingy.» - in which Twenty three years old Dazai & Chuuya find themselves in My Hero Academia world. They could've searched for a way back, toppled the Hero society, toppled the underground... But no. They create a Detective Agency. - or How Double Black solves MHA plot in... Ten chapters. - disclaimer Bungo Stray Dogs @ Kafka Asagiri Boku no Hero Academia @ Kōhei Horikoshi