Rule 34 Dev - 1girl arknights biko._(yamabiko720) black_coat black_footwear black_shorts blue_hair coat commentary demon_girl demon_horns demon_tail dual_wielding empty_eyes fur-trimmed_coat fur_trim grey_shirt halo highres holding holding_staff horns mostima_(arknights) muted_color outdoors ruins shirt shorts solo staff tail trailer|21494284812