satou hiroko, real life, photo (medium), 1girl, arm support, armpits, asian, black hair, blue one-piece swimsuit, blurry, breasts, breasts apart, closed eyes, collarbone, competition school swimsuit, covered navel, cowboy shot, day, depth of field, female focus, head tilt, legs together, lying, medium breasts, nature, on side, one-piece swimsuit, outdoors, parted lips, partially submerged, school swimsuit, sideboob, skindentation, solo, swimsuit, watermark, wet, wet clothes, wet hair