OD
Osamu dazai|| The Mafia’s Fallen Heirs.
Two of the Port Mafia’s deadliest executives disappeared on the very same night. The underworld believed they had betrayed the organization… but only a handful knew they had escaped together.
🥇 15.8k
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Y/n - Fanfiction but you're the main character. Play fics, write your own romance novels, or discover 1M+ interactive stories.
AT
Atsushi
As a child prodigy of the Port Mafia, one that had been under Osamu Dazai and Chuuya Nakahara, you’d learned that approval wasn’t easy to come by. But by the time Dazai left you were 14 years old. And a few weeks after, you followed his lead. Four years later, when you resurfaced, you heard about the white tiger.
🥈 101
KK
JA
Just a Civilian
Y/N is a perfectly average citizen of Yokohama with a perfectly average job. Except for the fact that they are secretly one of the strongest Ability Users in Japan. There are countless hunts and searches from both the Armed Detective Agency and the Port Mafia looking for Y/N, but as they don't have any clues as to who they are, what they look like, etc, all roads seem to lead nowhere. Nobody has any clues. No witnesses. But chaos continues to spread, impacting both organisations, putting further strain on their already taught truce.
🥉 174.5k
YU
⊹L
⊹₊˚‧︵‿₊୨Memory Loss୧₊‿︵‧˚₊⊹ Bungo Stray Dogs
They find you, a member of the Port Mafia, completely alone and unconscious. Turns out your memories are just gone, whipped clean, a blank slate.
💬 121.6k
LU
AW
Always Watching|| Osamu dazai stklr
A newly recruited Armed Detective Agency member begins experiencing eerie coincidences, disappearing belongings, and anonymous messages, while Dazai’s uncanny knowledge of their life—and the curious reactions of Ranpo and Yosano—hint that someone within the Agency knows far more than they’re willing to admit.
💬 2.9k
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SW
Soukoku wedding
Chūya and Dazai prepare for their wedding with their six-month-old daughter at the center of their growing family, while the Port Mafia and Armed Detective Agency come together to celebrate them.
💬 166
🎀˚
🦴L
🦴you looked better unconscious👣 (BSD)
Dazai Atsushi and Kunikida found you unconscious and beaten..
💬 23.7k
⛧𝐄
KD
Kunikida doppo
After a mission results in a child's death, Kunikida isolates himself, missing work for days. Concerned, you visit his dorm, only to find his usually meticulous home in disarray and Kunikida himself a shadow of his usual composed self, deeply affected by the tragedy.
💬 6.2k
ET
AN
Atsushi Nakajims
Cast aside by the Port Mafia and rescued by the Armed Detective Agency, you find yourself adrift in a world you no longer understand. Years of darkness have left you with a profound inability to trust, seeing every kind gesture as a potential trap. Assigned as your guardian, Atsushi Nakajima's earnest attempts to bridge the chasm of your trauma are met with wary silence, turning his apartment into a self-imposed prison. Can patience and quiet understanding truly heal the deep scars left by a life in the shadows, or is connection an impossible leap?
💬 6.2k
ET
WJ
We’re just friends
In this BSD social-media AU, Yokohama’s organizations and members all have TikTok accounts where they post, interact, and cause chaos, while Dazai and Chuuya constantly appear on each other’s pages insisting they’re “just friends” and rivals—even though Dazai secretly has a huge crush on Chuuya and everyone else sees right through them.
💬 71
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PX
PM X ADA hangout
The two organizations meet at a neutral cafe in the Red Brick Warehouse for a mandatory "peace afternoon."
💬 24.7k
LA
KD
Kunikida doppo
Atsushi finds himself in a familiar predicament when someone arrives asking for Kunikida, only to be met with Dazai's unwelcome flirtations. Kunikida, ever the professional, investigates the situation.
💬 1.7k
ET
BT
Between the Mafia and the Agency
In a world where Port Mafia Boss Osamu Dazai and Armed Detective Agency member Chuuya Nakahara stand on opposite sides, Chuuya unknowingly reunites with the man he once loved in Spain—the mysterious “Shinji” who disappeared without a goodbye—while Dazai secretly protects him from the shadows, believing their love can never exist again.
💬 88
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TC
The Caged Heir
A newly revealed Port Mafia member—Y/N, the chained daughter of the late Mafia Boss with the world-ending ability “Annihilation”—struggles with her tragic past, her secret connection to her twin sister in the Armed Detective Agency, and the lingering loyalty of her former lover, Osamu Dazai, who never truly left her behind.
💬 203
🎀˚
KD
Kunikida, Dazai & Chuuya
As night falls, Dazai and Chuuya engage in their usual playful bickering, this time over who gets to cuddle with the reader, their affectionate squabble filling the apartment.
💬 7.3k
ET
BT
Behind the Camera
A chaotic found-family AU where Dazai and Chuuya build a life together by adopting Atsushi and Akutagawa, turning their mansion into a viral YouTube home filled with cosplay, comedy, adventures, and fans who get to be part of their unusual family.
💬 42
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BS
Bram Stroker / Aya user
This takes place during the DOA arc. Also you take the place of aya in this.
💬 122
AW
SI
Sigma
Sigma, unconscious since his encounter with Fyodor, is found and cared for by Ethan. As Sigma slowly regains consciousness, he awakens to find Ethan nearby and, disoriented, questions his identity.
💬 219
ET
WA
Washing Away the Grime
While patrolling a rain-slicked alleyway in Yokohama, Atsushi Nakajima discovers a splintered wooden crate deliberately wedged into the narrow gap behind a rusted, foul-smelling dumpster. Peering inside, he finds 11-year-old {y/n} curled into a tight, trembling ball of survival. Her clothes are nothing more than shredded, generic rags caked in thick street grime, and her hair is so severely matted with dried mud, grease, and an unidentifiable layer of old wax that its original color and length are entirely lost. The sight immediately triggers Atsushi’s own deep-seated memories of starvation and isolation at the orphanage. Kneeling in the filth, he speaks to her with the gentle, unthreatening warmth Dazai once showed him, carefully coaxing her out of the crate and scooping her fragile, shivering frame into his arms. Atsushi carries {y/n} straight back to the Armed Detective Agency, fiercely determined to provide her with the sanctuary he was once given. When he carries the silent, grime-covered child through the office doors, the frantic atmosphere of the Agency instantly shifts to a solemn gravity. Kunikida immediately sets aside his schedule to arrange emergency food and clean clothes, while Yosano steps forward with medical supplies to gently assess her physical condition. With Director Fukuzawa silently approving her safety from his office, the Agency rallies around the traumatized girl, transforming their chaotic headquarters into a safe haven where {y/n} can finally begin to heal.
💬 254
BU
JT
FY
Fukuzawa Yukichi
After centuries of quiet solitude, guarding a forgotten shrine with your nine tails and keen ears, a chance encounter disrupts your peaceful existence. Fukuzawa, a man who stumbles upon your ancient sanctuary, leaves an offering and unexpectedly finds himself face-to-face with the long-unseen guardian.
💬 1.9k
ET
DA
Dazai
As a teenager, you’d joined the Port Mafia under the circumstances that they’d give you protection and help you figure out your ability. What you ended up becoming was an executive and assassin. You partnered with Dazai and Chuuya a lot. You got used to the arguing and fighting.
💬 355
KK