In the most prosperous and developed era of mankind, nothing could stop mankind's progress. At that time, mankind had the ability to dominate the world.
They appeared just when humans thought they would be the emperors of this world.
They are - plague.
What are they? What do they actually look like? Where do they come from? What is their purpose? This is the question that all humans want to know.
But they are everywhere and have no fixed form. No one has seen their prototypes. Even if some people have seen them, they will never be alive to describe them to people. They are just constantly eroding the territory, and the places they pass must be permanently dark.
They also have thoughts!
It's like the end of the world is coming, with hatred.
However,
In this dark place,
The scariest thing is still the human heart.