Is her upper body really turning 90°+ relative to her hips, or is she like that permanently (birth defect?)? Her outfit seems like it was cut for such a position as I don’t see any wrinkles in the cloth from such a twist at the waist, unless her right arm is concealing a gap between the skirt and the top that’s showing a fair amount of sideboob.
I don’t know about the story, but I’m currently underwhelmed by the artist.