Welcome to the story of Divine Ascension, currently this is just the first half of the prologue. The universe accidentally killed you and decided to give you a second chance in another world. Unable to be sent back to your original world; you were reborn into a fantasy world filled with monsters and magic.
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