1girl, animal_ears, arknights, bikini, braid, breasts, brown_eyes, brown_hair, choker, cloud, coat, coat_partially_removed, collarbone, horizon, in_water, jacket, jacket_over_swimsuit, looking_away, makeup_brush, medium_breasts, natsuba002, ocean, official_alternate_costume, on_ground, otter_ears, otter_tail, pantyhose, partially_immersed, roberta_(arknights), roberta_(summer_flowers)_(arknights), rock, seashell, shell, sitting, sky, solo, starfish, sunset, swimsuit, tail, tetrapod, wariza, waves, white_bikini, white_choker, white_coat, white_pantyhose