WMG: Dennou Coil
EldritchAbominations (the world inside the keyhole and the world accessed by obsolete spaces) exist side by side. You can only inhabit one at a time. You access them through certain points which stand out. Does this sound familiar? interacting with humans, Cyberspace weapons that can come out of nowhere, and
magical computer engineered portals that lead into the cybernetic world of Cyberspace.