The game places you in a situation where your girlfriend suffered a car accident and now experiences a form of recurring amnesia meaning that she not only forgot the last two years of her life (and ever meeting you) but also, every day she wakes up she forgets everything all over again. The story is full of twists and turns as you find out that the police are investigating foul play in her accident, her twin sister moves in with you two and a mysterious girl gives you her phone number.
Your girlfriend's condition, however, makes you face a very interesting situation where you can decide how to behave towards her. After all she forgets everything the next day. You could be a gentleman and treat her right, you can play it safe by not pushing too much in one direction or you could be a jerk and take advantage of her. That's all up to you. The game is focused heavily on decision making with various outcomes, some short term and others long term.
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