1girl, o, arm_support, bare_arms, bare_legs, bare_shoulders, barefoot, black_one-piece_swimsuit, blush, breasts, brown_eyes, brown_hair, from_side, hair_between_eyes, koutaro, long_hair, looking_at_viewer, looking_to_the_side, medium_breasts, one-piece_swimsuit, original, parted_lips, school_swimsuit, solo, swimsuit, towel, towel_around_neck, twitter_username, water, wet, wet_hair