Imagine a life, where you had to kill people to stay living. It's the year 2020, and a virus only known as "The Leech" has been created. The Leech is planned to be used to kill off most of the human race, by taking all emotion, and memory, out of the brain of test subjects and replacing is with an objective: kill to live. But what happens when a test subject doesn't get his human qualities fully removed?