When you find yourself trying to remember a show (or any works) that's on the tip of your tongue but just out of reach, come here - the collective brain of the TVTropes community can probably help. Post all the details you can remember (examples help). If you're looking for a trope, head over to Trope Finder. Have general questions about tropes? Visit Ask The Tropers!
jormis29
Since: Mar, 2012
livewithstyle
Since: May, 2016
2018-06-04 16:52:23
If it's not either of jormis's suggestions, you could check the Doom Magnet or The Jinx pages and see if any of the examples there ring a bell!
lactobacillus
Since: Jan, 2019

I think it is most likely an anime, based on what I normally watch.
A female character that attracts death, so that anyone near them dies. Pretty typical trope. I really can't remember much else aside from the MC promising he'd stay with her and not die. I'm sure it has been done multiple times, but I really can't remember much at all, and I don't expect anyone to just list off every example of it, but if anyone has ideas that would be great!