1girl, black_hair, black_one-piece_swimsuit, blue_one-piece_swimsuit, breasts, brown_eyes, chikuma_(kancolle), competition_swimsuit, covered_navel, dated, highleg, highleg_swimsuit, impossible_clothes, impossible_swimsuit, kantai_collection, large_breasts, long_hair, montemasa, multicolored_clothes, multicolored_swimsuit, one-piece_swimsuit, open_mouth, poolside, sitting, smile, solo, swimsuit, twitter_username, two-tone_swimsuit, wet, wet_clothes, wet_swimsuit, window