3girls absurdres aged_down alternate_breast_size animal_ears bag barefoot black_one-piece_swimsuit blonde_hair blush breasts bright_pupils brown_eyes brown_hair cat_ears collarbone commentary_request competition_swimsuit dual_persona feet flower hair_flower hair_ornament hand_on_own_chin height_difference highres holding holding_bag long_hair looking_to_the_side medium_hair misaka_imouto misaka_mikoto multicolored_clothes multicolored_swimsuit multiple_girls one-piece_swimsuit shokuhou_misaki simple_background small_breasts sparkle sparkling_eyes star-shaped_pupils star_(symbol) sweat swimsuit symbol-shaped_pupils teruya_(6w6y) toaru_kagaku_no_railgun toaru_majutsu_no_index toaru_majutsu_no_index:_new_testament tokiwadai_school_swimsuit yellow_pupils