1girl, adapted_costume, ahoge, ball, bare_arms, bare_legs, bare_shoulders, beach, bikini, black_bikini, blush, breasts, brown_hair, cleavage, closed_eyes, collarbone, hair_between_eyes, hairband, halterneck, kantai_collection, kerchief, kuromayu, large_breasts, long_hair, lying, navel, on_back, open_mouth, outdoors, sailor_bikini, sailor_collar, sand, shiratsuyu_(kancolle), shiratsuyu_kai_ni_(kancolle), sleeping, solo, string_bikini, swimsuit, tan, whistle, whistle_around_neck