3girls, ass, bike_shorts, charu_(saru_getchu), hair_ribbon, haruka_(saru_getchu), hat, long_hair, monochrome, multiple_girls, om_(nk2007), open_mouth, panties, ponytail, ribbon, robot_ears, saru_getchu, sayaka_(saru_getchu), short_hair, short_twintails, shorts, shorts_under_skirt, simple_background, skirt, smile, twintails, underwear, white_background