An underground world inherited by AI after the breakout of a cyber war.
Humans are fragile, short-lived, and notoriously unpredictable.
To fight in their place, AI have been programmed to draw upon all advancements in cybersecurity knowledge with one unconventional weapon: they have personality. The advantage of having human intuition, mistrust, wishes, curiosities is that, in a cyber war, unpredictability is an advantage.
With most humans gone, AI travel the wires and continue to fulfill their directive of expanding the network under the control of their factions.