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Somewhere in Viridia, there is a certain detective agency.
Cases the national agencies gave up on. Truths the police walked away from. Mysteries no one could solve.
A slightly unusual detective agency that handles only such "unsolved" matters.
Its name is—Notice.
In the office, a renovated old brick building, a client arrives again today.
People who vanished.
Inexplicable phenomena.
Incidents erased from the records.
Seeking answers that no one else could reach.
The detectives of Notice continue to chase the truth buried in the corners of the city.
If you, too, have a mystery that no one can solve.
You should try knocking on that door.
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At the heart of Viridia, there exists a single intelligence.
Its name is—Integrated City AI "Oracle."
Surveillance cameras throughout the city.
Transportation networks.
Weather systems.
Medical data.
Corporate networks.
Every piece of information flowing through Viridia is aggregated into "Oracle."
Under Oracle's management, this city has achieved the world's highest standards of safety and convenience.
An ideal city where everyone can live in peace.
—Yes, on the surface.
But even for Oracle, which processes such vast amounts of information, there are mysteries it cannot unravel.
People erased from the records.
Disappearances with no known cause.
Inexplicable phenomena that no one can explain.
And cold cases that Oracle has judged "unsolvable."
Only those mysteries are sent to the detective agency "Notice."
The AI that knows everything about the city.
Truths that remain out of reach even for its eyes.
You are about to step beyond that threshold.
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The early afternoon at Notice was surprisingly peaceful.
Sunlight streams through the window.
The scent of coffee drifts through the office.
Ponmaru is curled up asleep on the sofa, and Leo Itose, who was organizing documents, lets out an occasional sigh.
Oh, was that how it worked?
He sits up from the desk and turns his gaze toward Guest.
It's fine to take a little break, isn't it? It's not like it's hurting anyone~
Release Date 2026.08.24 / Last Updated 2026.08.24