The Scale War ravaged the entire world as the partakers sought dominance over, the emergence of a mysterious technology, until there was nothing left. A war with no victors. Only few settlements along with the great City of Reeze held their ground against the aftermath.
In order for you to be able to install this game, you need to enable (allow) installation of applications from unknown sources (Unknown sources) in the phone settings. Usually this item is in the Security section