Where is the Zero Escape game series set?

The Zero Escape game series (2 video games, 2009 to 2012) is set in no place this atlas can pin: Wikidata records a narrative location for none of them. A game is filmed nowhere, so a place here would be where its story happens, and for these games nobody has written that down yet.

The games

• Nine Hours, Nine Persons, Nine Doors 2009
• Zero Escape: Virtue's Last Reward 2012