Okay, okay, I might have sounded too harsh in my previous comments.
I never thought I would become this invested in this manga, even unconsciously. I tried to sympathize with Nomamoto. She was going through a rough time: working for pennies under what is essentially a racist alien, getting hit in the nose so often it practically became a running gag. Then she met Kitami, and it seemed like they were starting something on a good note. You could say that the aliens made her life miserable, and with her ability to consume them, she might have had the chance to start something bigger.
Now, I assume she’s living a relatively good life: Earning a ton of money from her job, which basically involves endlessly devouring aliens as they terraform Earth. And what does she do with that?
She stalks her miserable dad, who's divorced, living alone in a small place, once a month. And she has no real reason to hate him. At least for now, she herself says her life with him was pretty normal; she just didn’t vibe with her father (which, honestly, happens sometimes). But instead of leaving it at that, she picks on him simply because she doesn’t like him. No trauma. No major reason. She basically terrorizes him once a month because she finds it fun. She just can’t leave him alone. She doesn’t even confront him to show she’s doing better. No, she’s just being a dick because she can, and she enjoys it. This lines up with how she’s implied to not care about others, as long as she can keep eating aliens because they taste good.
Okay, I get that she’s been portrayed as apathetic even before the pra-alien virus situation, but this is supposed to be her “best moment,” and she celebrates it with something so criminally petty.
“You don’t need a sob story to hate someone” sounds borderline sociopathic, and this is Nomamoto at her peak. If this is the author’s way of killing the readers’ sympathy for her, then I applaud it, because it works. Congratulations.
I hope she dies miserably.