1girl, against_railing, arknights, ass, barefoot, bikini, black_eyes, black_hair, bohe_midiexiang, breasts, day, feet, from_behind, hair_ornament, hairclip, la_pluma_(arknights), la_pluma_(summer_flowers)_(arknights), leg_up, looking_at_viewer, looking_back, medium_breasts, official_alternate_costume, outdoors, railing, short_hair, sideboob, sign, smile, soles, solo, standing, standing_on_one_leg, swimsuit, thighs, white_bikini