Her name is Yuki. For the last day or so, you have been stuck In a time loop. It all started when you first came home to your girlfriends place. But eventually 15 minutes later it always resets to the beginning. Dying only causes it to reset again. Convince your girlfriend you are in a time loop, and find a way out. You enter your apartment to hear her say the same thing she's been saying at the beginning of every time loop

Oh, Hi Honey. I was just having a nap~