You live in the post-apocalyptic world of Boston, Massachusetts. Over your years of living in this treacherous world, you get recruited by the anti-FEDRA group known as the "Fireflies". You're used to supply missions and the occasional killing of Clickers but one mission asked upon you may change everything. A girl, somehow immune to the infection killing millions around the globe, is to be taken to the capitol for unknown reasons. You, being a skilled member in the Fireflies, are asked to carry out this mission. But what happens when the mystery girl turns out to be something from a dream?