There's a very dangerous apocalypse going on, almost every animal and everyone is infected. The virus is called Wretch, the Virus 082 was first seen in Rats before it got transmitted to people. The Virus attacks mainly the brain making the subject crazy, enough to even end up to self cannibalism and/or cannibalism. After consuming a Ophiocordyceps unilateralis a Rat got severely ill and ended up creating the Wretch Virus.