STORY

Two orphaned brothers, wandering in the underworld. The young boy is 12 years old when his sister born in this world. Her mother was the only smile they had in their lives, she doesn't remember it, a woman who suffered a lot from her health, her brother remembers, but things got complicated after the birth of her sister, two years later, her body couldn't take it.
They never knew who his father really was, and the young man never knew why she ended up pregnant again in her state of health. Being homeless, you don't have to imagine too much the situation that his mother had to face, alone with her children. He was forced to join gangs and commit crimes. If he can feed his sister.

A decade ago, a series of earthquakes have been ravaging the world, on the brink of a global crisis. Everything indicated that something was not right. Finally, one day the earth opened, exactly the day the young man turned 18, the sky turned orange, and all the demons inside the earth came to outside, after so many years being prisoners. They were finally seeking to rule the land that once belonged to them all this time.
But the boss was not only looking for that, he was looking for something else. As the earth start to corrupt, kidnapped people who had to decide whether to turn into beasts or follow their new leader and the nights, which lasted for weeks on the planet.

Before not long, the human beings already know that what they are facing is supernatural, and there is not even the most powerful weapon that could help them fight. The fight now becomes a fight to live in the midst of the apocalypse.
The young man takes refuge together with his sister in an abandoned building, he does not know what will happen, as the war progresses and the news of these supernatural beings entering his region, it is not long before he knows his fate, have been weeks since they had to cover in a refuge.

The new land makes the young man feel strange, the sensation of corruption made the air he breathe heavier, but with everything that was happening, surviving was more important.
The hours passed in the shelter of the abandoned building, an abandoned structure. But the young man feels that a presence is approaching, he doesn't know what it is or how to explain it, but he feels it, until the big boss appears in front of him and his sister, his scared sister, takes shelter from him, while the try to protect her. He doesn't know if they will die at this time.

The big boss smiles, he is looking for his child, he tells her that in order to conceive him, he had to rape his mother, and once pregnant, she would not survive for long. And he is one of many sons he fathered that day, for the purpose of making sons capable of ruling these lands with prudence. Since they are half human and half demon. His story, his courage, they make the devil smile, he seems fit for his lineage. His sister is actually human, and the devil himself disgust that, he cannot believe his son is protecting a human.

After hearing the latter, the brother couldn't take it anymore, his instinct with his half-demon blood was released, thanks to the Beast. Trying in some futile way to be able to fight with her father, her sister stays behind, watching everything, protected from a column coming out of the roof, terrified, seeing a scene that seems to be taken from a horror story, a creature with a fearsome appearance. Her brother's eyes shine, and as the fight progresses, he began to lose his human body little by little, he was transforming into something else due to the presence of corruption.

That instinct to rage and fight, despite that the difference in powers was enormous. He refused to abandon his sister and would fight with his last breath, his fight becoming more and more savage. Full of wounds, he did not realize until the noise of his sister's crying, screaming in panic, thrown under the claws of the great beast, that the young boy was able to recover his consciousness, he had already totally left, his human body.

-Everything is fine, its still me-. The young man tries to let him know that he is the same, while he was prostrated on the ground, he couldn't get him off his back. The beast looks pleased, although he knows that only scratches him, he likes that they have courage and fights until their last breath. The beast finally decides to end this once and for all, and after summoning his trident, he decides to deal the final blow, sticking it in the chest. The sister can't stand the scene, seeing her brother still struggling to get rid of that, already very weakened by everything, he runs to her brother and prostrates himself on him, begging her to leave him alone.

That feeling of fighting inspires the big boss, the young man can be something else. He catches his sister, the young man, totally turned into a demon, and badly injured by the blow, he was very weak and could barely breathe, his vision begins to blur. The big boss sees how he freezes his sister, and tells her your strength when you die, I am not interested in the weakest. If you want to see your sister again, you must hunt 300 demons, you decide if you want to see her again and lose your humanity, or keep what little you have left and flee-

Lying on the ground with the wounds on his chest. The young man hate himself, seeing his new hand trying to catch the Beast, who is leaving the area between the threes. Before faints from his injuries, being the last words of him that he hears from the Great Beast. His half-demon blood will allow him to recover again. When he wakes up, covered in blood, there is nothing and no one, is still in shock, blame himself for turn into this thing, but he knows, he gonna need this to save his sister. With the hate of humans and the demons which he gonna need to kill, he start to walk, and make this journey.

Many thanks to  RagnareK for this work. Based on a dream I had years ago, comments welcome !!