Cassie Becker, a survivor of a chemical assault during wartime, confronts a harsh new reality. Humanity has paid a heavy price following an attack that should never have occurred, leaving the survivors in a diminished state. Six months have passed since that fateful day, and the world is now a place of unimaginable devastation and pervasive fear. Determined to find the one person she cares about, Cassie embarks on a relentless quest, battling against beings that were once dear to her, in her unwavering mission to reunite.