Back 4 Blood begins with a meteor crash in Québec, Canada, leading to the discovery of the Devil Worm, a parasite that infects humans and turns them into the Ridden. The game's narrative follows a group of survivors known as Cleaners, who are immune to the Devil Worm and must fight to reclaim the world from the Ridden. The Cleaners' journey is marked by various Acts, each revealing more about their past and motivations. The game's story is rich with lore, character backstories, and the challenges faced by the Cleaners as they navigate the post-apocalyptic world.
