Fair point.
However saime could be said for Shiori, a creature that lived for centuries and not giving a damn about anything.
Then suddenly, she gave her flesh to human girl. And then fell in love with a human girl later on.
So yeah, being alive for centuries and hating someone for that long does not mean anything at all in this story. They can change their minds on a whim if plot demands that they do. Plus she has that strange little girl following her, I am sure she will also play a big part in Azami changing her mind.
It would be really funny thing if Azami really ends up being Hinako's family in the end and Hinako ends up becoming immortal despite her original wish.
Right - but the difference lies in what sets Hinako and Azami apart.
Azami has had centuries to build resentment and hatred and grief over what was done to her. And it was
done to her; she didn't ask Shiori to feed her flesh and turn her immortal. And that's part of the core of why she's so angry: her loss of agency in even being allowed to die, and thus she suffers alone with only that hatred fueling her and pushing her forward.
Shiori is the target of her ire, because Shiori is the one who did that to her. And at the time, Shiori had no way to conceptualize, much less empathize, with what she'd done to Azami. For her, immortality was a given. She had no way of knowing what it meant for a human to achieve the same, because she isn't human, and had no meaningful relationship with a human to begin to learn.
By the time she'd come to realize what she'd actually done to Azami, it was too late to "talk things out". Shiori wasn't yet at a point where she'd gain the "human-ness" that she would eventually possess via Hinako, and Azami was consumed with hatred and would never have listened to Shiori, even if given the option.
We see that here and now. Hinako herself says that Azami and Shiori should actually try and reason this out, and Azami dismisses her out of hand with barely any recognition for what she'd said.
By contrast - Hinako also wishes to die, but she has none of that hatred; only the grief of losing her family and an effectively-lethal case of survivor's guilt. That was also at the hands of Shiori, but the difference is in how their initial interactions played out. Shiori interacted with a young Hinako who
began to show her those human-like qualities of compassion and consideration and friendship. Something she didn't actually have when Azami was tossed into her lair all that time ago. And, Hinako sought out Shiori for what Shiori could do for her--namely, killing her, but it came from a place of love and loss and grief, not angry pain.
And, Hinako and Shiori have spent time around one another,
after Shiori had already expressed intent to learn more about Hinako and about humanity. She developed feelings for Hinako through a series of events and interactions and
time that she just never had with Azami, who fled and plotted and spent all her time bitter and resentful.
Azami entered Shiori's life at a point where any sort of "happy ending" for them and any potential relationship was impossible. Hinako and Shiori are different, for the reasons we have witnessed up to this point in the story.
If I'm being honest--I
don't want to see Azami live through this. Her whole deal is that she wants to die. Her surviving would fly in the face of her character arc; she should live through the final act, but she
should find peace, preferably not involving the death of Shiori. Because what Azami needs is catharsis for what was done to her all those centuries ago, that she had no say in, and that has seen her lose her family and friends and loved ones and everyone she'd ever known, and cursed her to a life of not
building relationships because she'll simply outlive everyone she meets.
I don't know how that will look, in the story--but that's what she needs.
And no--I'd lose respect for the author if Azami ends up being related to Hinako. I don't use the term often, but
that would be an asspull on their part; Hinako doesn't need immortality, because what she needs isn't to avoid death. But to find a reason to continue on and to lay to rest the burden of survivor's guilt and grief that she's carried this whole time.
Shiori can help her with that, and
has been working toward that point. But Hinako ending up immortal would likewise destroy the entire point of her character.