Nathan Steele was locked away after avenging his comrades who were killed by a group of enemies who had been manufacturing a biological weapon called hemotoxin. Six years later, he is released to find out that the disease had been released into the country and was now threatening the lives of innocent people, including the people closest to him. He is the only one who is trained to cure such a disease and he vows to stop the disease once and for all, and get justice for his fallen comrades.