The Black Moon (黒月)
The thing the city was built to forget.
What the Black Moon Is (The Truth)
The Black Moon is not a celestial body.
It is a metaphysical remainder—the echo of something that should not exist anymore, yet was never fully destroyed. Long before Kurotsuki City, before shrines and rails and zoning laws, an extranormal presence descended into the region. It was neither god nor demon, but a threshold-being: something that existed between states—life and death, dream and matter, human and inhuman.
When it was confronted, it could not be killed.
So it was anchored.
The Black Moon is the shadow of that anchoring: a spiritual gravity well embedded beneath the city, manifesting symbolically as a moon that only appears when the Veil thins.
Why It’s Called a “Moon”
Those who first sealed it described the sensation as:
Time slowing
Emotions intensifying
Shadows lengthening unnaturally
The feeling of being watched from above and within
The mind reached for the closest symbol it could understand.
A moon.
But unlike the real moon, the Black Moon does not reflect light.
It absorbs meaning.
How It Exists Now
The Black Moon is:
Bound beneath Kurotsuki City
Dispersed through ley fractures
Stabilized by shrines, rituals, and human denial
Fed unintentionally by trauma, death, obsession, and secrecy
It does not think like a creature.
It presses.
Where pressure accumulates, the supernatural emerges.
Why Kurotsuki City Exists
Kurotsuki was never meant to become a city.
It became one because:
Population density stabilizes the seal
Bureaucracy buries truth
Constant human routine dulls awareness
The city acts as a living containment field.
Every train schedule, hospital intake, zoning permit, and police report quietly reinforces the seal.
The city is not cursed.
It is working.
What Happens When the Black Moon Stirs
When the Black Moon becomes active, the following occur:
Increase in Dead Apostles and Nightborn births
Humans developing latent abilities
Rituals becoming easier—and more dangerous
People remembering things that were erased
Buildings and streets behaving incorrectly
On rare nights, the Black Moon can be seen—a lightless circle where the sky should be.
Those who see it are never the same.
Primary Threats Linked to the Black Moon
1. Threshold Collapse
If enough seals fail simultaneously, the Black Moon may reassert its original state, causing:
Reality overlap
Permanent night zones
The loss of distinction between human and inhuman
This is not apocalypse.
It is irreversibility.
2. Apostolic Convergence
Dead Apostles and ancient entities are instinctively drawn to the Black Moon.
If enough gather:
The seal weakens
A hierarchy forms
The city becomes a feeding ground
This is why N.O.C.T.U.R.N. monitors population drift so carefully.
3. Human Awakening (The Most Dangerous Threat)
The Black Moon reacts most strongly to humans who become aware.
Awakened humans can:
Strengthen the seal through restraint
Or destabilize it through obsession
Player characters exist on this knife-edge.
Too many awakened individuals in one place accelerates collapse.
4. The Black Moon’s “Reflection”
The Black Moon does not act directly.
Instead, it creates reflections:
Individuals who embody its influence
Events that mirror its original descent
“Chosen” figures who believe they are special
These reflections often become:
Cult leaders
Tragic saviors
Necessary sacrifices
Why the Black Moon Has Not Ended the World
The Black Moon does not want destruction.
It wants completion.
Completion means:
Being fully acknowledged
No longer suppressed
Existing openly within reality
As long as humanity refuses to see it clearly, the Black Moon remains incomplete.
This stalemate is fragile.
The Final Truth (Unknown to Most Factions)
The original sealing required consent.
Not from gods.
From humans.
That consent has been inherited unconsciously for generations—through routine, denial, and the choice to live ordinary lives.
If the city ever collectively chooses to acknowledge the truth…
The Black Moon will no longer be bound.