This absolutely did hit me in the feels, I'm glad that they're able to be together in some way, and I got kinda teary eyed when I saw that Ko has adopted Mahiru's old hairstyle.
Oh, damn, you're right. Shoot...
Er, this is less than tangential but, I'm like 70% sure that both Dagashi Kashi's Hajime Owari and this manga's Kyouko Mejiro are-- on some level-- author self-inserts. I figure, since the former is the protagonist of a Dagashi Kashi gaiden one-shot where her peculiar past as a mangaka is detailed, and the latter has been seen wearing drawing gloves despite manifestly not being an artist.
But if I'm being completely honest, this is not a fantastic way to end it. Unless Ko's half-vampire status also brings a significantly longer life, this essentially confirms that even if they stay together Nazuna is basically doomed to watch Ko age and die as she has to fight her urges. We know essentially nothing about Ko's half-vampire status, Nazuna's status as a born vampire might as well not matter whatsoever since it seems to have absolutely no effect on the vampire rules, and we have no idea how their future goes at all.
Me, I don't think I need to see snapshots of their lives to the end of them. I read a historical fiction that did something like that, and I found it labored (putting aside that it took very strange artistic liberties with history in order to set the stage for a completely fictitious romance between the protagonist and another major character).
I mean come on. No hug, no kissing, no Nazuna admitting that she really wanted to see him, not even any confirmation that Nazuna is gonna stop jerking him around and actually be with him now that he's proven he'll go to any lengths to be with her. BARELY EVEN ANY BLUSHING.
Putting aside her obvious tsundere act, Kou had to put her in a submission hold as soon as she registered that he had grown because she was going to try to suck him. This, despite the fact that his candidacy has long since expired and she probably shouldn't still be inclined to try to suck his blood.
She says it was "vampire instinct", but I think she was just really happy to see him.
I also liked the way that their reunion deflated the melancholy from the chapter up to that point. It reminded me of chapter 60, where Kou and Nazuna individually manage to make dramatic and cool deductions about Kabura's relationship with Nazuna that are completely off the mark.
Not even any real confirmation that the whole "Vampire sucking the blood of a human they love kills them" things, much less that it applies to Nazuna.
The only way to confirm that is if she actually tries. She's not going to try out of her own volition, because she doesn't want to chance killing Kou. The fact that a vampire actually came to love their subject would prevent them from doing so, unless they were as convinced as Kiku that they'd be the one dying AND themselves welcomed death.
It's as if, by design, it's borderline impossible for the question to be answered.