Versatile Mage: Dimensional Shadow

This is a world where magic reigns supreme and evil spirits roam the world!
Demons have taken over human territory.
Magic has become mankind’s last resort.
The emperor who lives on the roof of the world and the masters of the restricted areas of life fear each other!
The summoning plane attached to the magic plane swallows up the resources of the main plane bit by bit!
The dissatisfied emperor who unifies the dark plane is eyeing the magic plane!
Weak humans have become lambs to be slaughtered!
In this desperate world that should be united, those in high positions cut off all hope!
The angels who represent the divine and control the origin of magic regard the hope of mankind as disaster!
In this desperate world, there will always be someone who stands up to make a difference!
But…
the boy who masters magic cannot change the world, and the boy who becomes a devil has no intention of changing the world.
The brilliance of magic cannot open up the future of mankind!
The devil’s power has lost its focus due to wear and tear!
Teenagers with different ideals eventually take different paths…