The war between humans and ghosts decades ago ended with the demons being defeated and the humans victorious. Since then, all the sects that have learned magic have disappeared. The human emperor has returned to rule the earth, and the world seems to be at peace.
But is it really so?
(This article is purely fictitious. It refers to ancient systems but has been slightly modified. Please do not pursue research)
Purpose: If the people are safe, the world will be safe