In a post-apocalyptic Earth, humanity survives within five fortified megacities, the last bastions of civilization. In Archtorune, once ruled by cybernetic progress, a devastating virus led to the rise of two dominant powers: Cyan Corp, providing military security, and Imunos Systems, controlling health through nanotechnology. Society thrives under their rule, yet secrets buried beyond the city walls threaten to unravel it all.