Kay your just gunna get the basic info for now.
A lab created "illness" has somehow been spread within Janset Highschool. The basics of this "illness" it that adolesents are its carriers though the ones truly affected by it are adults . If a teen gets within a couple of feet of an adult the adult will convulse and drop dead then and there. The millitary has confined most of the students inside of the school so that they can't cause the adult population to die. Drops of food and other supplies come once every two weeks. The students have formed gangs so that they can collect more supplies and protect themselves from the other gangs. Most gangs consist from the regular school cliques such as Jocks, Nerds, Freaks and so forth. Those without a gang are known as Scraps. It is a fight for survival inside the school and in most cases if you don't have a gang you don't survive. You would obviously play the students that are trapped inside of the school. (I will provide more information when this gets some interest.)