(Various! Owari no Seraph x Reader) The Hyakuya Orphanage was known for its Seraph of the End Project, and (y/n), like many of the children at the orphanage, was experimented on. However, she was operated on by a man with different ideals than the rest of the orphanage. Instead of putting a seraph within her, the man gave her a power that could be wielded as both a destructive force or as a peacemaker-the power to read minds and share memories. As a result, (y/n) was known as the Catalyst Experiment at the Hyakuya Orphanage, because of her powers' potential ability to change the war between vampires and humans faster than anyone ever would have thought. Note: This is the first story I've ever written, so I'm sorry for any shitty cliché moments that come up. I'll try my best, but I can't guarantee that you'll like it.

The underground shelter's door opened, the 7th progenitor's hand reached out to you, scared at first, but you remembered your father's words: "If something happens to me or your mother and a vampire finds you, show them your fangs."

What if there were survivors who became there own army like The Moon Demon Company. They had demons as well but stronger. They have better technology. And they hid from their part of the seraph of the end project. This would be the Human Demon System in the Chinese Half Human Army. Two sisters who been side by side since they were little, work in the system.One sister named Mari Ann who was the older sister and the other was named Arosa Ann meet the Moon Demon Company and make peace. After learning each others pain and differences,Mari finds out what they were working on. And faces them to stop them from making the world worse than it is. But one thing stops her. She starts falling in love with Guren,even though she was just suppose to spy on them and kill them if necessary. But Mari hides something very dark about herself from JIDA, especially Kureto since he wants to use her for experiments. While Arosa also spies on Yuu for his strange sense of power,but starts having feelings as well. What will these Sisters do? I DO NOT OWN OWARINOSERAPH OR ITS CHARACTERS!!! I DO NOT OWN ART OR VIDEOS!!BUT some scenes in the anime will be in this fanfic book. I hope you enjoy it.....

[CURRENTLY REWRITING - ON HIATUS] After the spread of the virus and the start of a so-called apocalypse, Yuu, Mika, and their small family are taken by the vampires to a life of slavery and blood. Trapped, they fear for the worst but hope a girl that knows too much but says too little can help them escape. Mysterious and full of intriguing secrets, Mika and Yuu can't help but trust her as if she was family, even letting her in on their plan of escaping to the human world. But what happens when something goes wrong and it is undeniable that (y/n) had something to do with the event that took his familiy's life and broke Yuu's own to pieces? Shrouded in secrets and being impossibly humane for someone so far from being human, (y/n) is the paradox Yuu, Mika, the humans, and the vampires alike are aching to decipher, especially if it means uncovering the truth about their past and the reality they live in... Even if doing so will set fire and burn everything she built with them to dust.

What will happen when Krul's cousin comes to visit after being gone for so long? What will happen when the humans know she is back and now are ready to use her as cursed gear? The daughter of the devil himself has returned and she's about to have some fun with both humans, vampires and demons. Cover made by -Kyouka-

A deadly virus sweeps the Earth, leaving behind only children and vampires. Mayu is a young girl who was left an orphan after the virus killed her parents. She was then taken to an underground facility with all the other children, where she is forced to give her blood to them in order to survive. There she meets both Yuu and Mika, changing her life forever. How will things change for her?