The world is linked by 2 dimensions, the world of living beings and demons also called Geneha neithet of the 2 worlds can have any contact, but these demons can go to the world of living beings and posses and manipulate any human, see the case of Satan the Dark God of the underworld, Satan wants to enter the world of living beings, but there is no human body that can resist him, seeing this he fathered Rin Okumura his son and human, but it turns out that Rin Okumura realizes that he is the son of Satan and rejects him as a father, and he is not willing to follow his plans, after a failed attempt by satan to take and kill is protector Shiro Fujimoto, the Son of Satan decides to be an Exorcist.
