@mahtan
Yeah, this is very poorly written. I feel like there was a better initial intended direction, but the after making this MC seem competent again, the author just forced incompetence into the plot. If this world is so hard set like this, then she should honestly have been mercy killed at birth as she is essentially powerless. And there is seemingly nothing she can do to "fix" it as there is not a way to increase her mana capacity that we know of yet. It doesn't seem like effort alone can fix it either. So MC is basically going to become a supporting character in their own story to whomever gives her a pity handout because he is horny.
Now, why they introduced her as a noble, when she isn't meant to be treated, seen as, or even use any of the power that comes from being one, is such a bullshit excuse that the author tossed in just to make the MC a target for bullying. It is very unprofessional of the school to incite harassment when they themselves agreed to and set the precedent for her to be treated no different than any other student attending.
I can't see this MC getting anywhere given this setup becauae they haven't shown a way to do so. His knowledge will not do it, as shown already. She is powerless, even less than a common person is, and they spent 25+chapters basically showing that MC is worthless because it doesn't matter how talented elsewhere you are if you have no magic ability. How she managed to rein even get this far in life is beyond me.
MC is basically juat a battery now for someone else's power, and even then they suck at being one. And it has yet to be shown how to change that. And if it can't be changed, then this isn't worth reading anymore because the plot will be going nowhere for a long time it seems.