Shinku No yūsei

The Four ages, The first age in which humanity began, the expulsion of Adam and Eve due to the Sin of eating the forbidden Fruit. The second and Third is the age in which they start to flourish and also the age in which Human Fought for Domination and Power, causing Terror and Ruins. The Fourth and Final age is The Crimson Age in which Humanity will meet its demise.
-The Heavenly Sage.

The 23rd Century:

A century where Exorcists, Awakened humans and Alchemist exists, as they fight against curses, Demons and malevolant spirit. As Humanity shall survive these Disasters and prove to God that they are worthy to be spared and they can bring a change