Devilish Drug is a story about a young man and a certain drug in a world where being able to make genetic alterations is everything, status is not controled only by money, but also which genetic modifications you have, how "better" than a normal human you are.
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