Thoughts on the Origin of the Kingdom of X

This is a world of power, killers, strength, and cunning. Ordinary people are like a piece of grass, and their hearts and lungs are cut out when they move. It is a world that is crowded out and is like living in purgatory. However, it is described as a world full of rare birds, exotic beasts, property, treasures, demons, and secret realms that are like fantasy wonderland and fascinating. Until the arrival of an ideal and realistic soul from another world