The Kasio Korp was a rich company that thrived on selling highly valuable potions and drugs, herbs, and their seeds to the highest bidder. Maurice Kasio, the CEO, was such a powerful tycoon that he even had his own private army and assassins. His late wife, Layna, also gave birth to two siblings: a son named Mairyell, whom he attempted to groom for taking over the company, and later a daughter named Aeris. Their mother died when Aeris was a young child, and it was public knowledge that the cause was cancer. From the start, the Kasio siblings had always been a little wayward, which was reason for their father to worry. Mr. Kasio, ever the busy man, hired lackeys to keep an eye on his children and stop them from ruining his image.
It was not generally known that Mairyell contracted a demonic disease from his mother while she was pregnant. Nobody knew where this influence came from, but when it came time to address the seriousness of the situation, Mr. Kasio's true colors were shown. His human greed for power had warped his mind and caused him to avoid pouring funds into finding a cure for his wife's illness. After all, it was far more profitable for a company to treat symptoms of a patient than to cure diseases--if word got out that there was a cure for a new disease, the media would be all over over it. He had weaved a lie for his children, but his son sensed that there was deception in this. Mairyell doesn't, however, tell Aeris the truth about Mama's demise, but he always told her bed time stories about Mama whenever she asked him.
Sanity became scarce as their father started to fear them, especially Mairyell. The boy was showing symptoms similar to his mother, but instead of weakening him, it only made the boy stronger. Sedation became his father's favorite method to control him and suppress the demonic symptoms. He still had some twisted dream of making his son inherit his legacy, but the mutations were getting faster and harsher. It was too much. Soon, sedation doesn't work so Mr. Kasio locked up his own son. Unfortunately, he was not able to hide the truth from his daughter. When she found out, the very same demonic influence inspired her to burn down the Kasio Korp HQ. She did some damage, but ultimately failed. But her father was furious for she had managed to release Mairyell from his prison. Their father then disowned them and cast them away to another continent entirely. Unfortunately, Mairyell didn't have any medicine to control himself, so he would routinely freak out on Aeris. This was a problem that would not go away.
Despite the risks, Aeris and her brother began to continuously steal from their father's company warehouses, for medicine to control and sate Mairyell's vampiric metabolism. Not only did this cut into profits, but word spread that Kasio Korp was collapsing due to civil strife. Rivals began to push in on Mr. Kasio, both legally and not. It was during this time that Maurice began to increase the security of his warehouses, as well as sending in more and more assassins to seek out his 'dear' children. During one of the duo's raids, they found themselves unable to procure the medication they needed to sedate his strange urges. Because of their failed attempt, Mairyell went into a frenzy, attacking Aeris. During the attack he bit her, getting his first taste of her blood. Unlike any of the other blood he had had up to that point, Aeris' blood almost immediately satiated him. Though he regretted the act later, and tried desperately to keep from doing again afterward, he found himself unable to care during the 'meal.' A strange thing happened while her brother fed on her: the puncture wounds, while present, had not hurt her. Not one bit, and immediately after Mairyell stopped, the wounds closed soon after.
They were interrupted. Three human assassins dropped in on Mairyell and Aeris. The two of them were immediately ensnared with an acid-etched steel net, and rendered helpless. Mairyell, despite his strength, couldn't break the nets apart. It would seem the Kasio siblings would meet their fate then, but before their father's hit-men could kill them, a large winged being ambushed them, instantly killing one assassin with a large rock dropped from above. The next two assassins found themselves beheaded (and scorched) as Rinyl the Bulwark brandished his flaming sword. Melting the nets carefully, he freed the Kasios and explained that he was Aeris's guardian angel, sent to protect her at all costs for she would soon do great deeds. He added that their father had actually sent several teams before, but they were dispatched quietly. Rin then apologized for being late as a 'demon from the west' had intercepted him at night and demonstrated 'strange foreknowledge' of his assignment. It was noticed that Rin had puncture wounds on his neck, even though the assassins hadn't attacked him.
In reaction to the angel's appearance, Mairyell would at first be skeptical, and would likely remain as such throughout the majority of the two's interactions. Nonetheless, the vampire would accept Rinyl's assistance from then on, grateful for its help in rescuing them, but unsure of how he felt regarding the angel protecting his sister. After all, he did not know the fellow, and merely being of a certain caste among the angelic hierarchy did not warrant trust from the ever cautious Mairyell.
Aeris regarded the strange angel with caution, shielding her eyes from the bright flames licking across his sword. Her throat had dried as she witnessed him kill their ambushers. When it was all over, she looked up at him--worry seizing her face--but then realized that he was there to guard her, much to her confusion. Their first handful of exchanges were awkward, as she couldn't read his emotions, nor figure out his motives. It was all so very weird and alien to her, for she was only used to her big brother being her sole protector and guardian.
It became routine that during their travels, Rinyl would advise Aeris by scouting ahead where they wished to go. He was forced to trust Mairyell to protect his sister during this time. After months, the two began to accept Rinyl as a constant presence in their life. Though Mairyell kept his distance, Aeris began to show her gratitude towards Rinyl, mostly by trying to be friends with him and learn about him. The angel indulged her, somewhat reluctantly, but soon became, well, rather enamored with her. He kept those feelings to himself, however, as he knew what happened to angels who fell. He kept his mind on his mission, for the trio could rarely relax in one place before something else happened. It would seem that a curse followed their every footsteps.
One night, as another of Mairyell's manic episodes ensured, Rinyl fought Mairyell as he seemed, for some reason, meaner and more hostile than before. It worried Rin, and his honed instincts kicked in--the warriors ignored Aeris as they battled each other in a contest of wits and strength; however, they were both weakened from the fight. Having more experience and stamina, the guardian angel managed to whisk Aeris away and they disappeared into a sanctuary in which he had longed to shelter her, and train her to fight and protect herself. He never got that chance, though. When Mairyell found her again a couple days later, Rinyl was dead and Aeris was being consoled (in vain) by the sanctuary monks. He wasn't sure what had happened, but soon began to think himself to blame. Before they left, they attempted to bury Rin's body, but were denied. A squad of four pure angels emerged and while two of them wrapped Rinyl's body and picked him up, the other two brandished grimaces and scimitars at the Kasios. The angels uttered not a word as they left them behind.
The Council, however, were not done with the Kasio siblings' fate: they sent another angel, a specially trained one known as the Aurist...