I don't...
The plot isn't even a plot. 50 chapters wasted on tests to get medals from other families... tests that proved useless and have nothing to do with becoming the head of the family. The fl behaves one way and the last chapters another. The ml too, it seems like he first helps her and then sets the fire to kill Eather and her because the royal family...
Eather calling her big sister before dying when she was already gone. All of this makes no sense. Good art/drawings wasted.
I have drop this at chapter 15. Seriously, in 15 chapters, the protagonist hasn't made a single step forward.
And I've read other comments where she remains like this (being slapped in the face every time) even in the most recent chapters.
She seems to have no personal growth. It really looks ragebait with a nice cover.
At this point I'll abandon it, I think it's written with ai. And frankly, who ever wrote a story that says "I'll first talk to my sister who's been abusing me since she could, otherwise you take care of it"... is she stupid? Worse than those saintly female leads who don't lift a finger and rely on the knight or the prince to protect them.
The manga is too much. (I don't know about the novel.) However, at the beginning it makes it seem like the main plot is about the demons that keep appearing and the various orders of knights. However, after half a mission of two chapters maximum, the story shifts completely to banquets, high society, and so on... demons and knights' missions are completely forgotten with the excuse that "x characters are gone." The story itself is boring up until the chapter I got to.