"I woke up inside a burning room without any knowledge about my past, no memory and no plans, just confusion inside my head. I cannot recall any detail about me, I know the basic of daily life but I cannot recall where I learned from, I can speak the language but I cannot recall who taught me, I remember everything yet cannot remember anything about myself."
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