They're the only ones worth rooting for right now.
No one cares about the plot moving in a predictable direction (if you want to even call it that), and I say this as someone who literally predicted most that would've happened after the pathetic wedding crash.
My issue is that both the protagonist and the story doesn't even know what direction it wants to go.
Karina goes on about having revenge and we saw what that amounted to. Then we go a bit into her past, just to once again elaborate how she was forced into the role only to be thrown away, which we already knew... The only difference is that we get to see how the crown prince mistreated her... which honestly made the fact that she didn't even hurt him during the wedding crash even more ridiculous.
And now she's pretty much just wallowing in pity that the readers are supposed to also feel for her since either she's loved and/or hated for the role that she's in. And this will probably last until either Reshtoku gets tired of it and/or Aurora comes to 'rescue' her from her pain.
So in short, it's predictable, but it's certainly not coherent.
Karina not knowing where she wants to go with this is part of the point of her character.
You call it a "pathetic wedding crash", but that's part and parcel with the intent of the story. Karina's having a crash out, but it's impotent, because her rage isn't born of hatred or anger like she thinks, but emotional pain and sorrow.
She, as a character, is lost and adrift with her only known purpose pulled out from under her--despite all her efforts to the contrary. She was considered "the Spare" as a child and was always put second to her younger sister; she was abused by the Prince; she had rumors turned into propaganda to smear her name and reputation; and the moment the Prince could get the sister he
actually wanted, Karina was cast aside without ceremony, exiled, and then treated as dead without even a funeral service from her family, with her very name scrubbed from official records.
All her life, she tried to please others and rise to the occasion expected of her, and at every turn her efforts were for naught. She thought she was doing what was asked, and she was chased off and reviled for her troubles.
She's
suffering, and she's more lost and injured and confused than she is wrathful. She boasted, talked a big game about extravagant revenge when recruiting Reshtoka, but that was never going to happen--because her heart isn't in it for revenge, but for approval and affirmation that all her suffering wasn't in vain.
She seeks it from her parents, from Orlando, from Aurora. She
could be getting it from Reshtoka, but Karina is blinded by her past, and can't see the wolfkin wife in front of her--which, is why they've had little development of their relationship up to this point.
I think part of the problem is people want this to be a story about a Villainess' revenge against those who wronged her, and that everyone other than her and Reshtoka are objectively bad guys with naught by nefarious and malicious intentions.
And that's not what's being portrayed.
I'd argue that this is a story about a young woman who strove to find purpose in her actions for others, was rejected, hated, and cast out instead, and is lost and adrift. She is found by a Monster, who wishes only to make her happy--but she is misguided in what truly has wounded her heart, and so no solace can be found no matter what is done for her.
From there, it's a question of whether understanding can be attained between them, or if it will twist and putrefy until the Monster decides 'enough is enough' and ends her suffering, permanently.
Interestingly--that's the plot that we know of, of "The Monster Princess". We've yet to see the characters locate Volume II, and so we don't currently know the fate of the story. But even as Eve is incorrect in whether Karina & Reshtoka are willfully reenacting the story, it
is mirroring the true events.
Karina, the Princess, is deeply emotionally wounded after being cast out into the wilderness by her family and loved ones. She is found by her Monster, Reshtoka, who seeks to make her happy, bringing her everything she asks for in the attempt.
But like the Princess, Karina's hurts can't be sated, because what Karina hasn't yet identified the true root of the problems that have culminated in how her life has played out. We don't know how things will go, and neither do we know how the "The Monster Princess" will conclude, because like Eve, we don't have the rest of the story in-hand.
I'd argue it is
very coherent, but that it's being given to readers piecemeal, as the stage is being set and the characters arrayed.
We're only getting the biased and limited perspectives of each, and it'll be up to we the readers to determine who is correct, and/or by how much, just as Eve has to parse the reports and the testimonials about the truth of Karina in an effort to get to the bottom of what has been happening.
And she's in a race against time, because Karina
is unraveling, Reshtoka will becoming increasingly stressed in her helplessness to aid her, Aurora is seeking her sister to currently-unknown ends that are being intentionally left vague or unspoken, and the Prince & Crown seek to silence Karina permanently.