You as the main protagonist will get to go through your day to day life at home and school as you get to bare witness to many of the characters gradually giving in to their desires. Even pushing some characters down a more corrupted path. With over 40 characters there are so many possibilities in this adventure.
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