This world has been circulating a legend like this:

One day, the demon king will descend into this world, under the devil’s command, there are seven terrifying demon heads, and they will bring the darkness of despair to this world.

Planets die and gods fall.

After the collapse of the legal world, mankind lost all its protectors.

Now.

"Abnormalities" and "disasters" begin to invade the human world.

As the dark age approaches, a soul from Blue Star arrives through time.