We start the story of how Annie came to be down in the depths of Hell in the demon part of it, where demons reside and wait to be told their duties, where Ellenia came into existence.
Ellenia was born to a Succubus mother and a Warrior Demon father, both soon abandoning her when she was at the age to not get eaten by the various monsters that inhabited the demon area, she was born with pale skin just like her mother, being half Succubus she would use her pale skin to trick and attract humans if she ever went to the "surface world".
As time went on Ellenia began to inherit some of her father's skills in combat, and after years of practice through her childhood she soon became one of the top fighters in the demon world, using her charm to lull her opponents then strike at the most opportune moments, she had also been watching a demon named Denica from afar, admiring him to the point that she could say she had a crush on him, as days went by with her practice the day eventually came where she was put in to fight in the demon Colosseum, Ellenia managed to defeat every opponent that she faced, every challenge that was given...until...she was faced with Denica....in a fight to the death...needless to say Ellenia hesitated, and refused to fight Denica which of course angered Lucifer, one of his top entertainers refusing to fight...because of love? Lucifer did the only thing he thought reasonable, sentencing Ellenia to live the rest of eternity on Earth, and informing her that if she ever stepped back into Hell then she would be destroyed. Denica was furious at the fact that Ellenia did not fight him, and to this day he seeks to track her down and destroy her himself.
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Now we look at Harmony's story, her's is a little more cheerier.
In the angel area of Heaven, Harmony was a simple angel with simple needs, born to two loving angel parents and given a life of love and happiness, taught all the right things as well as having a best friend called Clarissa to play with, as she grew up Harmony became interested in art, mainly sketching and drawing and so she would sometimes visit Earth to sketch the beautiful things that she saw, she would also be assigned to watch over children before actual Guardian Angels were assigned to them, she loved her angelic life.
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Now we see how these two stories piece together, how a demon and an angel came to possess a simple human girl.
Kerin Iness was a girl brought up like any normal girl, on the outskirts of Jump City in a small town, but her parents were very judgmental, hearing stories of "freaks" in Jump City and telling her to never go there.
As Kerin was walking home from school one day Ellenia was trying to think of what to do now that she had an eternity on Earth, seeing Kerin she decided to have some fun and possess her, planning to do all sorts of evil things while in control of a human, but at that exact moment of possession Harmony was witness to it and immediately possessed the girl too, planning to kick the demon out of the girl...but as the two fought inside Kerin they found that they had become stuck within Kerin's soul, making her soul part angel, part human and part demon as well as giving Kerin a massive headache.
As time went on the changes with Kerin's soul started to effect her physically and mentally, occasionally she would hear the voices of Harmony and Ellenia bickering and fighting as well as experiencing painful backaches in two specific areas on her back, more and more of Kerin started to change, she would sometimes see her irises flicker to different colours, but she just passed it off as her mind playing tricks on her, one afternoon, after Kerin had come home from school and went up to her bedroom she suddenly had more back pains...except this time they went on for seemingly ages, as if something was trying to come out from her back...suddenly a pair of wings burst out from her back, splattering the room in blood and causing Kerin to faint.
A few hours later when Kerin woke up she had noticed that on her back was a feathered angelic wing on her right and a leathery demonic wing on her left, her iris colours had also changed from a dark blue to a sky blue one on her right and an ash grey one on her left, as she stood up she stared at herself in her mirror, wondering what the heck she had become, she was now able to hear Harmony's and Ellenia's voices clearly, the two explaining to her what they had done and what she had turned into, that night once her parents got home from work she tied to explain to them what had happened, but they simply chose to throw her out of the house, calling her "one of those freaks" and other such hurtful names.
From then on Kerin decided to abandon her name, renaming herself simply "Annie" feeling the name fit as she was part angel and part demon, she felt the name sounded innocent, but also holding back darkness, just as she was, for the first few months she lived in an abandoned cottage in the nearby woods, using Harmony and Ellenia to help her survive until they convinced her to go to Jump City, flying for miles and miles until she reached it and collapsing on a rooftop from exhaustion.
Now, Annie lives in the streets of Jump City, trying to find any job she can to help her survive, having met Ayumu Ishimaru while she was also living on the streets, the two becoming friends and looked out for each other for a short time before Ayumu was recruited into the SVR, Annie also befriended a friendly fox who took pity on Annie's poor state and provided her with food that the fox had stolen, that fox came to be Nina Vulpes, Annie now occasionally visits her two friends when she is in desperate need of food or shelter for the night but unfortunately neither can provide for themselves as well as Annie, so she is forced to remain on the streets of Jump City.