1girl, armpits, arms_up, beach_umbrella, bikini, black_hair, blush, breasts, breasts_apart, idolmaster, idolmaster_cinderella_girls, looking_at_viewer, matoba_risa, navel, nyubebe, outdoors, ribs, small_breasts, smile, solo, string_bikini, sunlight, swimsuit, twintails, umbrella, upper_body, yellow_bikini