1girl, animal_ears, arknights, ass, bare_shoulders, black_hair, blue_sky, brown_eyes, feet_out_of_frame, jacket, official_alternate_costume, outdoors, roberta_(arknights), roberta_(summer_flowers)_(arknights), short_hair, short_shorts, shorts, sitting, sky, solo, tail, thighs, welt_(kinsei_koutenkyoku), white_jacket, white_shorts