Same environment, different time. Because she can live someone's memory, that means she can travel through time. We can see the same environment in the real world but at different times. And even how the peoples in that time behaves, are different. And she also uses the power of time when trying to help people erasing their regret. She can turn back that moment over, and over again until she changes something major. But if she does, she can't go back anymore, whether it is a good or bad result. That part of the game is unforgiving.