The Sanctum is business simulator of the adult kind, in a modern world where elves, orcs and other races exist.
You live a rather quaint life in the underground city of Korthaven, a city ruled by a power hungry dark elven council. In the eve of a passing of one such politician, you get a knock on your door and a rather beautiful visitor, an elf named Kim. She informs you that you are the bastard son of a dark elven lord and that you've inherited his property and fortune. This includes Kim, a slave.
There are provisions to the will however. You must use the money to convert an old temple into a "den of pleasure". A den of pleasure called "The Sanctum".
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