The game is set in a post-apocalyptic world and takes place one year after the events of Metro 2033, proceeding from where Artyom chose to call down the missile strike on the Dark Ones. The Rangers have since occupied the D6 military facility, a pre-war bunker with miles of tunnels the Rangers have not yet fully explored. Thanks to his work in destroying the Dark Ones, Artyom has become an official Ranger. Artyom and the Rangers are informed that a single Dark One survived the missile strike. Khan believes the Dark One is the key to humanity’s future and wants to make peace with it. However, the Ranger’s leader wants to kill the creature to end the threat of the Dark Ones forever.