A new, strange disease has spread throughout Midorijima. What were once normal young men and woman have changed, becoming cannibalistic and dangerous. A prison has been set up to contain such cases until a cure is found, but many still roam the streets. Some have even found ways to spread the disease to others, doing so forcibly to increase their numbers and allies. One such recruit makes a mistake during a regular hunt, finding himself in a most precarious situation.