Supreme in the supernatural world

When you think the end is coming, only the beginning begins. The girl did not know anything about demons, vampires and other creatures. She died and plunged into a world of fiction, as many people who do not believe in them think. But who knew that she would become the Supreme One and would come face to face with the demon that everyone was afraid of? Having died, she lost the most precious thing in her life. She must go through all the challenges alone. Will she be able to become Supreme? Or will she die forever, with no chance of life?