1girl, animal_ears, arknights, bikini, braid, breasts, brown_eyes, brown_hair, choker, cleavage, from_above, half-closed_eyes, jacket, large_breasts, looking_at_viewer, lyas, lying, off_shoulder, official_alternate_costume, on_side, one_eye_closed, open_clothes, open_jacket, otter_ears, partially_submerged, roberta_(arknights), roberta_(summer_flowers)_(arknights), seashell, shell, solo, starfish, swimsuit, upper_body, white_bikini, white_choker, white_jacket