Nearly 70 years ago an unexplainable virus broke out,  infecting about half of the population, leaving those affected in the "contaminated" category. This virus transformed the once considered normal citizens of our society into a blood-hungry beings. After reconstructing the peril society, and beginning to study the contaminated, the government deemed them functionable, with minor altercations, and thus they were granted the ability to live amongst the humans. They hold normal jobs,