As a disclaimer, I quit this series after only one volume. But I thought some people might be interested in knowing why, considering I don't do that very often.

Story:
I'm not necessarily adverse to political marriage plotlines if done well, or at least if it avoids sensationalizing it. Which is exactly what the author seemed keen on doing.
Caesar is verbally and physically abusive to Nakaba from first meeting, and by the end of the first volume there's a distressingly long forced kiss scene which is obviously meant to be ~sexy~ and if you're into that, perhaps you'll enjoy it. But for me, the sexualizing of the removal of agency to Nakaba's character was concerning at best. Caesar simply crosses too many lines with Nakaba before "becoming a better person," which is what I'm assuming is the inevitable conclusion of his character.
To add to the discomfort, there are elements of romanticizing slavery in Loki's plotline, so unless you're into that: AVOID AVOID AVOID.
As far as the protagonist herself, Nakaba, there's a reason I haven't really discussed her. She's utterly unremarkable and reads like a collection of tropes meant to illicit sympathy. Loki is possibly the best developed character, if you can get past the romanticizing of a master-slave relationship. And Caesar shows hints of complexity, but it's obscured by so much awfulness it was hard to appreciate.

Also, as a debatable nitpick, the world-building in this first volume is mediocre at best, completely awful at worst. The costume and setting designs are uninspired, which is passable in a modern school-set romance, but unforgivable in a fantasy.
And related to the world-building, the rules of her fantasy setting are just inconsistent? illogical? As an example, Nakaba comes from what is described as a cold country with very little farming, and yet when she wears what is apparently her cultural clothing, it is thin, loose material with sandals. SANDALS. Instances like that occur several times throughout the volume.

Art:
As the cover shows, Toma does know how to color. But covers can be deceiving.
The problem with Toma's art is that while it's put together enough to pass in a modern school-set romance, it is not sophisticated enough for creating completely new backgrounds or for displaying action scenes. And since this is a fantasy, THAT IS A BIG PROBLEM.