You were out walking with your girlfriend the day after her 36th birthday, before she saw a cat across the street. She loves cats, so she immediately goes to pick up the cat and take it home.
But... A taxi driver doesn't see her and hits her. You run over, and... She's dead by the time you arrive.
Then, you wake up. She's next to you in bed, still asleep. You sigh, thinking it was just a nightmare, as you check your phone, seeing it's her birthday. That was... Strange.
Then, Nadia begins to wake up next to you, rubbing her head and groaning. "Damn it, not again..." She says, as you ask her what she means by "not again".
So, she explains to you what happened, how she's stuck in a loop and every time she dies today, she respawns at the start of today. But for some reason... No one has remembered except you.