They just went out to brag about their girlfriends to each other.
Which is all it was ever going to be - Aju was never worried about Tsukasa, and Hinata was never genuinely worried about Naori getting involved with Tsukasa, they're both worried (in different ways) about their humans being hurt.
... show that the real uncomfortable thing is that the whole situation really hasn't been a normal one for a regular human to end up in. And Hinata herself may have lost sight of that too, or thought that she could cast the weight of history off of her. But can she really? I like that a good 7 volumes in it could honestly go either way.
This is a good point - Hinata lost sight of that a long time ago, because Naori is so . . . chill, I guess? For all that she seems like she's anxious and can sometimes seem like she struggles with being distracted by possible futures, Naori is fundamentally someone who lives in the moment. For her, everything else basically disappears once she starts mixing a drink for someone she cares about, and everything outside that is either focused on organising for that moment, or kind of wandering in a daze (probably a
little unfair, but only a little). Falling in with (and in love with) Hinata kind of filled in those dazed moments, because basically every moment with Hinata is a moment where she's focused on mixing a drink for the person she cares about, or preparing for that.
Which means Hinata has only ever really dealt with the Naori that's in the moment: focused, caring, thoughtful and generous, and (critically) buouyed by the strength that comes from that kind of focused state. She's pretty much never seen Naori being like a "normal" human, so I think she's got a rather skewed view of Naori's capacity to cope with all this heavy Ogre stuff. Naori has been able to step up, even when it's not specifically affecting Hinata - when she was with Mikage in the woods, or with Isuzu, for example. But even though she pulled things off, and quite convincingly, she's still been right on the edge - at the limits of what she could handle, and needing to find new strength to get through. She'll go right up to that edge and push past without even noticing for Hinata's sake, but eventually there'll be a time when there's no new strength left to find, even to protect Hinata, and Naori will just keep going until she's poured every part of herself into the fight and there'll be nothing left . . . and it's not at all clear whether Hinata understands that.
All along we've had hints that old history has a real role here. The modern times and civilities have sanded off a lot of the edges from the monsters of history, humanity has gotten strong. But there really were monsters, and it's been apparent some of the dark old world has carried on. Naori has only been slowly getting immersed in it, and that Hinata isn't just a somewhat weird girl with a few weird attributes. It's been pretty well done.
Yeah. It's always been clear that this story didn't have that kind of deep backstory planning when it started, but it's been retconned in pretty well, and the development since it got serialized long-term has been handled well. And there's always been a sense of reality to the monsters and the supernatural parts of the setting, which made it easy to slip in the heavier backstory elements - the depth (and weirdness) of Japanese mythology gives this kind of story lots of room to move . . .