Catfish

I don't mind Esther being a girl, but I am lowkey disappointed she's humanoid at all. Just was excited for a man and his big battle kitty (;´Д`)

Huh. The characters are more reasonable than I first thought after reading the comments lol
I wonder if suzumes human side never aged and that's the reason why she was still a child when she tried to remain human for her brother. Would kinda explain why she was so easily tricked into killing shirayuki.
With demons being all about violence and stuff I can see that situation escalating, although I feel it's a bit rushed and a bit too flat for my taste.
Mc on the other hand does a very good job on reflecting and trying to mature with experience so far. Figuring out who he is, what his values are and not just giving in into blind rage and hatred like his sister did.