I'm not sure why people are assuming that she is "The Villain" this doesn't seem to be a hero vs villain dynamic. the MC is looking a bit problematic himself.
Everyone is talking about necrophilia, but why is no one concerned with the fact that this kid is CARRYING HIS SWORDS UPSIDEDOWN. He is supposed to be someone who cares about his swords, he is literally causing them to go dull by carrying his Katanas edge down on his belt.
@BuffSoul In my opinion Qi is most easily understood experientially. As someone who remains a skeptic on a variety of subjects I still personally accept Qi likely exists. I've never felt my Dantian but I have felt some of the meridians in my arm to the degree it was painful so I can accept that...