1girl, arknights, bare_shoulders, blue_sky, braid, brown_eyes, brown_hair, choker, closed_mouth, day, expressionless, from_side, jacket, long_sleeves, looking_at_viewer, looking_to_the_side, nanaco_(nana11jellyfish), official_alternate_costume, open_clothes, open_jacket, outdoors, roberta_(arknights), roberta_(summer_flowers)_(arknights), side_braid, sky, solo, starfish, upper_body, water, white_choker, white_jacket