Attack on Titan. I don't remember where exactly, though, I just recognize the maneuver-gear on the female.
I would say it was at the start or middle. It is the scene were her boyfriend friend (not explicitly stated) was previously devoured by a Titan. She was discovered during cleanup of the mess after another (successful) attack on the walls, trying to revive him for hours - without success...
Edit: Found it https://attackontitan.fandom.com/wiki/Franz_Kefka
I found it to be pretty clear. Her chest compressions look all wrong. His chances of survival would have easily doubled if she had just learned proper chest compressions