You wake up after having a strange dream in which you met a strange girl named Olivia. Soon you meet this girl in real life and find out that she is the sister of your friend. How this encounter will turn out and who you will choose depends only from you.
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