1girl, 3_(sanyako1), animal_ears, arknights, bikini, blue_sky, blush, breasts, brown_eyes, brown_hair, choker, cleavage, day, extra_ears, jacket, large_breasts, long_sleeves, looking_at_viewer, navel, o-ring, o-ring_choker, official_alternate_costume, open_clothes, open_jacket, outdoors, parted_lips, roberta_(arknights), roberta_(summer_flowers)_(arknights), seashell, see-through, shell, shell_to_ear, short_hair, sky, smile, solo, starfish, swimsuit, water, wet, wet_clothes, white_bikini, white_choker, white_jacket