4girls, ahoge, anger_vein, back-to-back, between_breasts, black_hair, blouse, blue_skirt, blush, breasts, crab, hair_bobbles, hair_ornament, head_between_breasts, hug, long_hair, looking_back, medium_breasts, multiple_girls, open_mouth, pink_hair, pleated_skirt, purple_eyes, purple_hair, school_uniform, serafuku, short_hair, short_sleeves, simple_background, skirt, teeth, twintails, twitter_username, white_background, white_blouse