You gotta remember, she isn't human, she's a yokai. Physically and intelligence wise she's similar, but ultimately her mental state is completely different. Killing humans is no different than a human killing a deer, at least from her perspective. At the end of the day Yokais have to eat
To a certain degree I agree, but I think that's kind of the point. His old mentor was never meant to be a major point in the manga, Rokusute meant nothing to his mentor. It's why the main brunt of his backstory so far is focused on Rokusute mending the fact that his mentor cared nothing about...
I want to love this manga but I fucking hate the child chapters, I don’t care if nothing actually happens it’s still super uncomfortable and 126 downright gross, I’m unfortunately going to have to drop this for my own mental health.