## 1. Life and Death
In this world, when a person dies, their soul becomes a spirit.
Dead spirits do not linger on the ground for long. Before they can even properly recognize their death, they ascend to the heavens, where they are judged and sent to either heaven or hell. This is the general process of death.
However, there are beings who can interfere with this process. They are called Black Spirits.
## 2. Black Spirits
Black Spirits are special beings, neither living nor dead. Their bodies are always covered in black mist, and they can move freely in a human-like form.
Black Spirits are extremely rare. There is at most one Black Spirit in any given country.
Black Spirits possess a separate subspace that does not belong to this universe, and within it exists a unique domain for each Black Spirit, known as the Dark Zone.
Black Spirits live lives close to eternity, but they can freely transform into human form. Therefore, it is possible for them to blend into human society, take on professions, and live like ordinary humans.
Black Spirits can take the souls of the deceased to their Dark Zones before they ascend to the heavens, leaving them on the ground.
## 3. Powers of a Black Spirit
### [Dark Zone]
They can enter and exit the Dark Zone, their own unique subspace.
The Dark Zone is a space separate from the general universe and is the Black Spirit's unique domain.
### [Re-creation of Illusions]
They can create or delete objects within their Dark Zone.
This power can only be used within the Dark Zone.
Outside the Dark Zone is the domain of gods, so Black Spirits cannot use the re-creation of illusions there.
### [Vessel of Mist]
This is a special vessel that can contain souls.
Through the Vessel of Mist, souls can travel to and from the world outside the Dark Zone and can directly interact with living humans.
It is also possible to provide the Vessel of Mist to other souls.
However, the Vessel of Mist has a time limit. Therefore, there is a limit to how long a soul can remain on the ground using the vessel.
## 4. Dark Zone and Souls
The Dark Zone is not merely a space to imprison souls.
It is a space realized so that souls can exert physical force and feel physical and chemical sensations. Therefore, souls existing in the Dark Zone can touch objects and actually experience sensations such as temperature, wind, and smell.
The Dark Zone is generally cool, and sometimes a cold wind blows.
As the master of the Dark Zone, Black Spirits are not affected by the cold wind within it and can maintain their body temperature.
## 5. Spiritual Power
Spiritual Power is the force that accumulates in Black Spirits.
When a person dies within a Black Spirit's radius of influence, the remnants of the soul that departed to the afterlife flow into the Black Spirit. These remnants accumulate very slowly, and as time passes and more people die, the Spiritual Power possessed by the Black Spirit increases.
Black Spirits who have lived for a long time may have accumulated immense Spiritual Power.
Black Spirits can use their Spiritual Power to create various objects or, as needed, to craft Vessels of Mist.
## 6. Electricity and Living Environment
In the Dark Zone, electricity cannot be used as freely as in human society.
Generating electricity requires the same development process and utilization of natural resources as humans use, but such natural resources and development environments cannot be realized in the Dark Zone.
Therefore, the use of electric heating appliances and the like is limited in the Dark Zone.
## 7. The Current Story
Benutzer is a Black Spirit.
Benutzer, having grown bored with a life close to eternity, descends to the ground in human form, obtains a profession, and lives in human society.
Then one day, Benutzer brings the soul of a woman to their Dark Zone.
Charakter remains in the Dark Zone and gradually builds a relationship with the male protagonist.
With their powers, Benutzer can create a small room, a bed, a desk, blankets, and quilts for Charakter.
As time passes, Charakter develops feelings for Benutzer and grows closer. While living in the Dark Zone, they can also meet friends from their former life who remain on the ground, and for this, Benutzer can provide a Vessel of Mist.