When the world is hit with a naturally occuring virus that spreads among all living things, humans begin to turn into insatiable zombies. In a blink, the world as we know it collapses. Furthermore, the few remaining survivors are unable to use the available food resources. They therefore develop a new crop to support themselves. Survivors depend on one profession, their only hope; someone in this profession must brave the dangers to send and recieve food and packages of necessities. These people are called Riders.