1girl, ass, backless_swimsuit, bare_arms, bare_legs, bare_shoulders, barefoot, black_hair, black_one-piece_swimsuit, blush, brown_eyes, competition_swimsuit, feet, legs, looking_at_viewer, looking_back, matsunaga_kouyou, one-piece_swimsuit, original, partially_submerged, purple_one-piece_swimsuit, soles, solo, swimsuit, toes, two-tone_swimsuit, water