You take on the role of MC (Yuu, you can change the name) who has lost everything and one day he meets a demon and is given a chance to relive his life. Now its time for you to go back and change everything that happened in the past and save those who you hold dearly. With the help of demon and her powers you can now get all the girls in the game.
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