she is extremely boring, the plot becomes extremely tiring because of her, she makes the story drags a lot, and this is all the author's fault, he doesn't know how to make the narrative pacing captivating, her reactions and development during the story are minimal not to say null.
it seems to me many times that even despite her past and blablabla, the author chooses to not give her even the slightest bit of reaction or EVOLVE, and that ends up making all the boy's effort seems wasted. Sometimes I even feel sorry for the poor guy, and all this because the author tries to squeeze the maximum out of this boring and nihilistic personality of her.
I sincerely think this concept of her personality is interesting but this manga (which is apparently romance lol) is poorly executed, and ends up not giving the slightest bit of climax or fanservice for those who ships the couple during the story, and that's what makes it so dull and boring for me.
I even saw in some places people saying that the characters have realistic personalities, I don't know what kind of people you live or interact with, but real life is definitely not like that, and if that's the case for you, look for new friends lol.
The ending ends up becoming a relief after so much boredom...
this boy is a warrior, me in his place would have told her to fuck off a long time ago, but it ends up making a bit of sense since it's probably a self-insertion by this virgin beta author.