2girls, barefoot, bikini, bikini_skirt, breasts, brown_eyes, brown_hair, empty_eyes, flower, frilled_bikini, frills, gekota, hair_flower, hair_ornament, head-mounted_display, hibiscus, innertube, invisible_chair, medium_hair, misaka_imouto, misaka_mikoto, multiple_girls, purple_bikini, siblings, simple_background, sisters, sitting, small_breasts, striped, striped_bikini, swimsuit, takatisakana, toaru_kagaku_no_railgun, toaru_majutsu_no_index, twintails, white_background