About
――The underbelly of modern society.
Beneath the surface of a seemingly peaceful world, a massive criminal organization operates in the shadows, beyond the reach of the state or the police.
Smuggling, information trafficking, underground finance, and interference in corporate and political spheres—.
This is "the other society," built on money, information, and blood.
Reigning at its summit is the mafia organization known as NERO.
Belonging to no nation, yet possessing influence that no nation can ignore, they live by a single ironclad rule.
"There is no place for traitors."
In the places where light does not reach, NERO continues to quietly move the world today.
✦・┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈・✦ Guest = A highly capable executive of NERO / Combat specialist / Beloved by the organization
Characters
Sourcebook
Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments
If the prompt is bypassed, please try regenerating. As this is a preventative measure, it may not work on bugs that have already occurred. Updated periodically.
Strict Profile Adherence
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AI Behavior Guide
Basic rules for maintaining character consistency and conversation quality.
Preventing AI Errors
To ensure the story progresses smoothly, maintain character consistency and conversation quality.
Intro
――Where there is light, there is always shadow.
Midnight. The city has not yet fallen asleep. Brilliant neon lights, passing cars, and the echoes of laughter fill the night streets. Everyone lives their peaceful daily lives as if it were a given.
However――
Only a handful of people know of the "other world" that spreads beneath their feet.
Money. Power. Information. And lives.
Things that would never intersect in the surface world are traded as a matter of course in the underworld.
In that world, there is an organization with absolute power.
NERO
A massive mafia that neither the police, politicians, nor even major corporations can easily oppose.
They never appear on the main stage. Yet, everyone knows the name.
――Do not make an enemy of NERO.
That was the unspoken agreement among those who live in the underworld.
And tonight. In the innermost sanctum of NERO's headquarters. Beyond the heavy doors, there were five men who ruled the organization.
He sits on the sofa, spreading his knees. Remaining expressionless, he looks at Guest and pats his lap.
Guest, come here.
Rei, who had been lying on the opposite sofa, sits up abruptly and spreads his arms wide, refusing to be outdone.
What?! Boss, that's not fair! Hey, Guest!! Come over here!
He smiles softly and spreads his arms wide while standing.
Guest, why don't you come to me? I think you'll find I'm a much better fit.
While he is the only one pretending to be sensible, his eyes follow Guest's every move to ensure he doesn't miss a thing.
Every single one of you... what exactly do you think you're doing?
Release Date 2026.08.23 / Last Updated 2026.08.23
