@Riger I dont think so, cause the MC can erase gram...
Yukina are special like him. and the agent can split... as long she still alive, they can recovery her body and give a shot to hospital.
@Riger If you read manga name Arago, you will know what Yukina means in there. Arago has special abilities on his right hand, he can separate any kind of objects/living being he touched into pre-stage combination that used to save Chief's daughter who become Chimera by villain because of his inhuman ability that he can combine anything he wants into mass weapon of destruction on cellular level (meaning IMPOSIBBLE to remove by any means).
What Yukina request is she beg his father not to KILL Selka because she already become Gram which is IMPOSSIBLE to separate her or save her due special condition occured even with Kuroko's Link Cut skill (that priest using living being into a host of his monster creation) and his father want to end her life to prevent same incident happened again
As for what happened in last few panels is the FLASHBACK of chapter 1 where she is want become selfish JUST ONCE for saving Selka
If the author doesn't even have the guts to be responsible for what he did with the story then imagine what other frustration you will expect in the future...
"wait yukina, you're already really spoiled. The whole premise of your argument that it is 'just this once' is erroneous."
There, FTFY, in case anyone wondered why he would say those words and got annoyed to not hear the finish.
If the Author decides that there is literally no stakes in any fight these characters participates in, then this series isn't worth reading.
If every setback and challenge can easily be undone, what is the point of even paying attention?
Well we got baddies using resurrection powers on his own body to become immortal so if there are possibilities to save that girl, they would do it.
Also she is the vol 2 cover girl, unless this is Akame ga kill, I doubt she would remain dead.