The World & Lore
The city. The Book. The real authors. The connections that make BSD something you can’t stop thinking about.
The Setting
Yokohama — The City at Twilight
BSD is set in Yokohama, Japan — a real port city that has historically been one of Japan’s most cosmopolitan and internationally connected places. In the BSD world, Yokohama is the rare city where ability users are permitted to operate openly, governed by a complex balance of power between the Armed Detective Agency, the Port Mafia, and the government’s Special Abilities Division.
The ADA describes itself as standing “at the precipice of twilight” — the time between the worlds of the day and the night. It’s not accidental language. Yokohama in BSD exists in that exact ambiguous space: a city where the law and the lawless have reached an uneasy equilibrium, and where the difference between hero and villain depends heavily on which side of the story you’re standing on.
When the Guild arrives from North America, and then when Fyodor begins his operation, that equilibrium is what everyone is trying to either protect or destroy.
The Power Structure of Yokohama
Armed Detective Agency
Handles ability-user crimes the government and police cannot touch. Operates as a neutral third party with tenuous government recognition. The Mafia tolerates them because they keep the peace — and the government tolerates the Mafia for the same reason.
Port Mafia
Controls the underworld. Has roots in the city’s politics and economy deep enough to move governments. The wardens of the night who maintain a perverse kind of order in the shadows.
Special Abilities Division
The government’s own ability-user force. The Hunting Dogs — an elite group with terrifying individual powers — fall under this umbrella. They operate by law but not always by justice.
Foreign Powers
The Guild (North America), the Rats (stateless), and the Decay of the Angel (fabricated) all arrive from outside and destabilize everything. The balance Yokohama has maintained for years collapses when external forces decide the city matters.
The Central MacGuffin
The Book — The Thing Everyone Is After
Hidden somewhere within Yokohama is a Book with the power to rewrite reality itself. Whatever is written in it becomes true. It can reshape the world, alter history, and change the fundamental nature of existence.
Every major faction either wants it or wants to ensure no one else gets it. The Guild came to Yokohama for it. Fyodor’s entire operation — the Rats, the Decay of the Angel, the years of chess-game manipulation — is ultimately in service of finding and using it to eliminate all ability users from the world.
What makes the Book compelling as a plot device is that BSD doesn’t treat it as simply good or evil. The question isn’t whether the Book should exist — it’s about who gets to hold the pen. And in this world, every person who wants it has a reason that is internally coherent and externally catastrophic.
Who Wants It and Why
Fitzgerald / The Guild
To resurrect his daughter. Every terrible thing Fitzgerald does is in service of one devastating personal loss.
Fyodor Dostoevsky
To write ability users out of existence entirely. He considers them a sin against humanity. He will do anything — including engineering wars and massacres — to reach it.
The ADA / Port Mafia
To ensure no one else gets there first. Their temporary alliances across the series exist because the alternative — someone catastrophically wrong getting the Book — is worse than working together.
The Concept That Makes BSD Special
Real Authors, Real Books, Real Connections
Every character in BSD is a fictionalized version of a real author, and their ability is named after that author’s most famous or most thematically relevant work. This isn’t decoration — it changes how you read the characters. Once you know what the real authors actually wrote and who they actually were, the BSD versions become layered in ways that are easy to miss on first watch.
Osamu Dazai → No Longer Human
The real Dazai’s most famous novel is a confessional about a man who performs happiness for others because he cannot feel like a real human being — and who is consumed by a death wish. The BSD Dazai’s constant suicidal comedy is not entirely a joke. It’s the novel wearing a grin.
Ryunosuke Akutagawa → Rashōmon
The real story is about the collapse of moral absolutes — a man decides to do evil to survive, and in doing so becomes indistinguishable from the evil he condemned. BSD’s Akutagawa operates in exactly this moral space: a man trained to violence who questions whether he could have been anything else.
Atsushi Nakajima → The Moon Over the Mountain
The real story is about a man who fails as a poet and transforms into a tiger — losing his humanity but gaining a kind of terrible clarity. BSD’s Atsushi is at the beginning of that journey: still figuring out if the tiger is a curse or a gift.
Fyodor Dostoevsky → Crime and Punishment
The real novel follows a man who commits murder based on an intellectual theory that certain people are exempt from conventional morality. BSD’s Fyodor is this taken to its logical extreme — a man who genuinely believes his reasoning places him above ordinary human constraint.
Kyūsaku Yumeno → Dogra Magra
One of Japan’s “three great strange novels” — an amnesiac psychiatric patient who cannot separate his own consciousness from the experiments being performed on him. Q’s inability to simply exist without their ability becoming a weapon, and their hatred of hospitals, come directly from this source material.
F. Scott Fitzgerald → The Great Gatsby
Gatsby is fundamentally about the illusion that enough wealth and ambition can buy you anything — including things that cannot be bought. BSD’s Fitzgerald literally burns money to gain power, and his entire story is about discovering the one thing it cannot purchase.
H.P. Lovecraft → The Great Old Ones
The real Lovecraft wrote about cosmic entities so far beyond human understanding that merely perceiving them causes madness. BSD takes this entirely literally — Lovecraft’s character is one of those entities, passing time on Earth under a contract, walking back into the ocean when it’s done.
Akiko Yosano → Thou Shalt Not Die
The real Yosano Akiko was one of Japan’s most controversial feminist poets — her poem “Thou Shalt Not Die” was written to her brother during the Russo-Japanese War, pleading with him not to sacrifice himself for the Emperor. BSD’s Yosano carries that same fierce refusal to accept death as noble or required.
Why Any of This Matters
The Trick BSD Pulls Off
BSD doesn’t just use literary names as flavor. By basing each character on a real author and naming each ability after a real work, the series creates a second layer of meaning that runs beneath the surface of every fight, every conversation, every character arc.
When Akutagawa’s black coat tears through reality, that’s not just spectacle — it’s the same force that Akutagawa’s stories say lives underneath all moral certainty. When Dazai makes someone’s ability simply stop working, that’s the literary Dazai’s central wound turned into a superpower: the inability to feel what everyone else feels, externalized as the ability to cancel everyone else’s gifts.
And then there’s the literary genealogy woven into the action. Q’s curse doesn’t work on Lovecraft — because in real literary history, H.P. Lovecraft was one of Yumeno Kyūsaku’s biggest inspirations. The real Poe inspired the real Ranpo Edogawa. BSD uses these actual historical connections as game mechanics. Their literary relationships become their combat dynamics.
You can enjoy BSD as action. But pull one thread — why is Dazai’s power called No Longer Human? Who was the real Akutagawa? Why does Fitzgerald’s ability involve money? — and suddenly you’re reading about early 20th-century literature and you have no idea how you got there. That’s the trick. That’s why a 16-year-old builds a 48-page slideshow and doesn’t consider stopping.