1girl, amagami, ass, black_hair, black_one-piece_swimsuit, black_socks, breasts, brown_eyes, competition_swimsuit, from_behind, full_body, kneehighs, kneepits, looking_at_viewer, looking_back, medium_breasts, nanasaki_ai, one-piece_swimsuit, racerback, short_hair, signature, socks, solo, swimsuit, twitter_username, two-tone_swimsuit, yoo_tenchi