1girl, arknights, ball, balloon, bare_shoulders, beachball, bikini, black_hair, breasts, brown_eyes, character_name, cleavage, day, goggles, goggles_around_neck, hair_intakes, happy_birthday, holding, holding_balloon, id_card, jacket, jacket_over_swimsuit, la_pluma_(arknights), la_pluma_(summer_flowers)_(arknights), long_sleeves, medium_breasts, mouth_hold, nakatsuka123, official_alternate_costume, open_clothes, open_jacket, outdoors, partially_submerged, short_hair, solo, swimming, swimsuit, upper_body, water, whistle, whistle_around_neck, white_bikini, white_jacket