2girls, d, back-to-back, bare_arms, bare_shoulders, blue_one-piece_swimsuit, blush, brown_hair, closed_mouth, collarbone, green_eyes, grey_background, hair_between_eyes, hair_ribbon, long_hair, multiple_girls, old_school_swimsuit, one-piece_swimsuit, original, ponytail, purple_eyes, purple_hair, ribbon, school_swimsuit, shibacha, simple_background, smile, swimsuit, yellow_ribbon