In the late 21st century, the abandoned AIDA network — a former military training simulator — has continued expanding autonomously long after its shutdown. Hackers have begun infiltrating its deeper sectors in search of classified data worth selling on the black market. You play one such nameless hacker who jacks into the system, battling through waves of alien bug-like creatures that now populate AIDA's self-generating architecture. The deeper you go, the more danger multiplies — a rumor circulates that those who delve too far contract the Achiba Syndrome, a condition that permanently traps the user's consciousness inside the simulation.