The story follows a group of high school students as they deal with a worldwide catastrophic event known as the outbreak. As the students try to survive the zombie apocalypse, they must also face the additional threats of societal collapse, in the form of dangerous fellow survivors, and the possible decay of their own moral codes. Starting from the high school, the students evacuate into town where they must deal with terrifying enemies. They will soon split off from the group and must survive on their own while watching more of their classmates and teachers being eaten alive. How much longer do they have? Will they ever be able to find their families?