Merci is a part of a spy agency who gives there spies Time Respon Pills. So if they die after eating the pills, time reminds to back to the point they swallow the pills.

Merci comes to her safe house from her mission but an assasin with a gun is waiting calmly in a seat. He tells her to sit and says that the agency thinks her performance isn't worth the price of time pills they give her. She pretends to be sad and begs for her life but swallows a time pill that's hidden on her.
Then merci breaks character of being sad and arrogantly says "I just swallowed my immortal pill, The pills only works on females so if you kill me ill keep coming back until I kill you. You death is guaranteed"
The assasin says "I was hoping you'd do that, I volunteered for this mission. Ever since I saw how long and sexy ur neck was, strangling you was all I ever dreamed about."
Merci says, "does my long neck turn you on. Your little penis is going to get you killed, any last word assassin"
The assasin attacks her in a rage and strangles her to death.
Eveytime she dies the assassin strokes her neck and Adam's apple.
Then time resets to wear she eats the pill, she remembers each time she died but no matter what she does differently she is strangled to death. She is trapped in strangling he'll.

Elements
Mostly neck fetish video and strangle fetish video

Neck fetish