I don't know when, a creature appeared in the world. They enjoy hunting and preying on humans, and are cruel and vicious in nature.
They have a unified name called "monsters".
The humans who hunt them are called "demon hunters".
However, the gap in numbers and strength puts humans at a disadvantage, and more and more demon hunters and civilians are becoming victims of monsters.
There is a legend.
Pandora opened her box, and greed, killing, fear, pain, disease, and desire were all released.
Fortunately, hope also comes out of the box.
No one knows where the box ended up.
Some people say that there is one thing left in this box, and that is "powerful power".
The box that was once hailed as a disaster has now become the last glimmer of hope for demon hunters and humanity.