Is she selfish?
Ha, you are right. Not only is she selfish, but she is also indifferent, unsentimental, and won't even blink an eye when she kills someone.
So what?
Since this is her necessary way of survival, why shouldn't she take it calmly?
She likes this city very much.
There are crowds of people during the day, demons dancing wildly at night, old ghosts living in the school, and an old Black Mountain demon hiding in the hospital...
She really likes such harmony and liveliness!
I love it so much that I want to ruin everything!