Den-noh Coil/WMG
The creators of the virtual reality in Dennou Coil played Eversion
Think about it. A nice world (the actual virtual reality) and a horrible world populated by Eldritch Abominations (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?
Den-noh Coil is the futuristic, Japanese parallel to Toon Town.
No duh, mon. Seriously, we've got cybernetic pets and creatures interacting with humans, Cyberspace weapons that can come out of nowhere, and magical computer engineered portals that lead into the cybernetic world of Cyberspace.