Let's compare.
Asa dying:
>Would be extremely shocking and emotional for the readers.
>Wouldn't matter much in-universe because no one really cares about Asa, her death would be a footnote for Denji compared to Nayuta's.
>Doesn't advance the antagonist's agendas.
>Defuses the plot anticlimatically.
>Can't happen before her dream.
>Repetitive, makes her suicide attempts redundant.

Denji dying:
>Would be extremely shocking and emotional for the readers (no, this place celebrating doesn't count).
>Would utterly mindrape Asa.
>Would mindrape Yoru even.
>Advances the antagonist's agendas
>Greatly escalates the stakes.
>Justifies Asa's dream.
>Foreshadowed through the entire story.
>Denji himself is half-complacent with being weaponized and already accepted that he's getting fucked again.

>>283010887
>pee drops something good for once

>>282986351
Grvke
The manga's pacing and retcons are terrible so the anime would be hopleless even with KnY budget

But they could have AT LEAST tried

>>282063188
EQUAL relationships anon, if you dom her one night you gotta get dommed the next one