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

Soukoku high School au full of fluff because these two deserve to be happy too. Characters may be ooc especially Dazai, but a soft Dazai for once isn't that bad ...

When a mysterious singularity tears through Yokohama, Chuuya Nakahara and Dazai Osamu find themselves hurled into a world where supernatural powers are the norm-and not just for the gifted. As Chuuya grapples with the loss of control in an unfamiliar society of heroes and villains, he must navigate new alliances, growing tensions, and the manipulative nature of Osamu Dazai. --- I did use Copilot and ChatGpt for the plot and ideas, so if I copied your story or someone else's, let me know! Thank you to ahh_ppl for being my first reader!