The hero I support will definitely defeat the devil

Traveling through time and space to a different world of swords and magic, and the existence of a system, should have been a happy thing.
But Youze couldn't be happy.
Because he has become a system!
It is also a system that trains brave men to defeat the devil.
The most important thing is that this system is still half broken!
Looking at the thin little girl host in front of him, and then at his own tattered body, You Ze felt that he might not be able to complete this task.
N years later...
Youze: Demon King, clean your neck and wait!