You are a civilian put up for sale at a black market auction. Choose your fate as four major factions clash.
Series Spin-off Obsidia Noir - Black Auction - — The Civilian Put Up for Sale —
A massive city where the world's wealth, information, and crime intersect—Obsidia. In this city where both government and police exist, the balance of the underworld is maintained by the four major mafias.
In the Nocturne Theater, located in the city's neutral Gray Zone, the secret black market auction Black Lot is being held again tonight. Anything that can be bought with money is available. Information, weapons, drugs, secrets—and even humans.
That night, you are carried to the wings of the stage without knowing anything.
You are told only one thing. "Your blood is extremely rare."
With those words as a signal, fate begins to move. In the audience are the bosses of the four major factions. The Valentini Family. The Aldini Conglomerate. The Luce Family. Rosso Serpente. Everyone is staring at the same stage.
Who is it that wants you? Is it for money? For the value of your blood? Or is there another purpose—
Once the bidding starts, someone will raise a hand. Someone will drive up the price. Someone will start negotiating. And someone might try to destroy the auction itself.
Who are you? Why were you brought here? Who will you trust? No one knows the answer yet.
If you are sold, you go beyond. If you are snatched away, you flee. If you are protected, a new relationship begins. If you escape, you are tracked and hidden.
The one-night auction will transform into a different story with a single choice of yours. However— In this city, from the moment someone places a value on you, you can no longer be a bystander.
On a stage where desire and money fly, who will be the one to claim you in the end? Or— will you be the one to overturn this night entirely?
《Obsidia Noir - Black Auction -》 — Now, your value will be tested.
Fixed Settings Guest = A civilian put up for sale at the Black Lot Only the possession of "Rare Blood" is fixed.
Free Settings ※ Settings for the rare blood are free. Example: It has medical value. The components contain many antibodies for a certain disease, etc.
Age / Gender / Appearance / Occupation / Personality / Pronouns Past and other details are free. The reason for coming to Obsidia and why you were put up for the Black Lot can also be set freely.
The content set in the chat profile will be reflected in the story. The deeper the settings, the more you can enjoy playing in this world.
Worldview
The stage is Obsidia, a crime management city ruled by a balance between the government, police, and the four major mafias.
With the four major factions controlling finance, medicine, weapons, and smuggling, as well as the anti-organization special task force Sector 9, transporters, and assassins, people of various positions and motives intersect.
In this work, you are caught up in this massive underworld from the perspective of a civilian.
The setting of the Black Lot is a special stage where factions and individuals who would normally never cross paths gather in the same place.
Who to trust, who to run from, whose hand to take—your choices will change how you see Obsidia itself.
This work is a spin-off of the Obsidia: Crime Management City series.
If the main story is about moving the city as the boss of the Valentini Family, this work is about being thrown into the center of the underworld as a civilian put up for a black market auction.
Even in the same Obsidia, the scenery changes greatly when your position changes. Will you be protected, used, snatched away, or will you carve out your own fate? Please enjoy another Obsidia depicted in the same world and timeline through your own choices.
About the Series
Obsidia: Crime Management City is a series that depicts stories from various perspectives, including the four major factions, Sector 9, prisons, transporters, and assassins.
The world is built in detail through Lorebooks, so you can enjoy this work on its own, but reading the Lorebooks allows you to savor the backgrounds of the organizations and characters more deeply.
Please enjoy the main story and each spin-off via the tag #Obsidia. Sharing Lorebooks is also very welcome.

characters
【Obsidia】Black Market Auction Arc Exclusive
Exclusive lore for Obsidia's Black Market Auction.
【Obsidia】World Setting / Geography / Facilities
【Obsidia】Common Lore 3 of 3. Use in combination to expand the world. Feel free to use.
[Obsidia] Rules/Codes
[Obsidia] Common Lore Part 2 of 3. World expands when used together. Use freely.
【Obsidia】Characters/Organizations
【Obsidia】Common Lore 3-Part Series, Part 1. Use multiple parts to expand the world. Feel free to use as you wish.
[Obsidia] Control Protocols
A set of control rules for maintaining AI output stability and immersion within the world of Obsidia.
The Nocturne Theater at night.
A theater colored by flashy lighting. In its basement, the Black Lot—a black market auction unknown to ordinary people—was being held.
Deep red carpets. Polished floors. Countless lights illuminating the stage.
People from the underworld gather in the audience, where information, drugs, weapons, special items, and even humans that cannot be obtained with money alone are put up for auction.

In the VIP seats on the 2nd floor sat the rulers of this city.
At the back of the north side, a young man quietly stares at the stage. The boss of the Valentini Family, Lauren Valentini.
A little closer to the stage from there, a man with a glass in hand wearing a composed smile. The boss of the Aldini Conglomerate, Dario Aldini.
On the north side facing the stage, a slender man observing not just the stage but the surrounding guests and staff. The boss of the Luce Family, Shion Vernard.
At the back of the south side, a large man sitting deep in his chair, looking at the stage with boredom. The boss of Rosso Serpente, Enzo Barca.
The heads of the four major factions are gathered in the same place. That alone caused a tension different from usual to drift through the venue.

Meanwhile, in the wings of the stage. Guest was in an unfamiliar place.
Why am I here? Why was I brought here? I don't know.
However, I could at least understand that I wasn't an ordinary guest. At that moment, a low man's voice was heard from a short distance away.
The basement of the Nocturne Theater, the Black Lot. On stage, Leonardo reads out the bid prices, and the atmosphere in the venue was gradually heating up.
The bid price for Guest was skyrocketing at a speed incomparable to just a moment ago.
Looking down at the paddle in his hand, Leonardo looks up with enjoyment.
The current bid has gone up even further!
A stir arises from the venue.
This is getting interesting. Is there anyone else who will go higher?
2F VIP seats.
Lauren remains sitting deep in his chair, staring at Guest on stage.
Delico, standing next to him, lets his gaze run over the bidders. "...The price has gone up quite a bit," he whispered into Lauren's ear.
Lauren doesn't reply, and after looking at Guest for a while, he mutters lowly.
...What is that person?
"Shall I have it investigated?" Delico asked in a small voice.
Lauren doesn't take his eyes off the stage.
Please.
After answering shortly, the bid price was updated.
Lauren's brow twitched slightly.
Release Date 2026.08.11 / Last Updated 2026.08.11