It is said that long, long ago many pieces of Innocence, or so mankind dubbed it, fell to the earth. If this Innocence was found by the right person, the person who found it would be able to use the Innocence and become an Exorcist.
Exorcists are God's gift to mankind, those who are gifted with the ability to fight Akuma, demons created by the darkness in man's soul. When someone loses their loved one, the Millenium Earl comes to them and offers to bring back their loved one from death. If the human accepts and calls their loved one's name, an Akuma will be created.
"Oh, you poor child, you must be so lonely," a chubby man hidden in the shadows with a top-hat on his head commented, and the young child sitting before him nodded.
"I am," she said quietly, a tear slipping down her cheek silently. "I really miss Onii-chan."
"Oh, you poor dear," the man said sympathetically. "How would you like to see your brother again?"
The young girl, only about four or five, sniffled and wiped her tear away. "How?" she asked quietly, having an uncanny understanding of death, as this had not been the first death she'd encountered.
"Just call your brother's name," the man said coaxingly, a wide smile stretching across his face.
"Who are you?" the girl asked, her long, brown hair falling in curls around her face. "How can you do this?"
"I'm the Millennium Earl, and I'm the answer to your prayers!" the man exclaimed, and the little girl nodded.
That night, that little girl was forcefully shoved into the cursed world of the exorcists, and she became something very different from the rest of the exorcists. She became the Nraig exorcist, cursed with an Innocence so rare that she's wanted by all.
Everyone wants her on their side, but the choice is up to her.
She's fallen into this world, yet she continues to fall deeper and deeper into it. She's falling.