Hell Bound

One ability in the world that changes you from the rest of the human kind. In order to attain this ability, you must kill your parents and drink their blood. Then you will go through a series of beyond painful changes which includes growing new irises and pupils in your eyes and your old pure white soul filling with blood and darkness.
This process is called 'Soul Tainting'.
Only few survive this transition. And if you do, you are to go to a certain school for ten years for training. Because once you have completed the transition, you are an official demon; closest thing to a vampires description in this world....

...My old name was Sarah Smith.
But today, I am Snow.