2girls, barefoot, bikini, blue_one-piece_swimsuit, blue_sky, cloud, day, hiryuu_(kancolle), horizon, kantai_collection, multiple_girls, ocean, one-piece_swimsuit, outdoors, partially_submerged, side-tie_bikini_bottom, sky, souryuu_(kancolle), swimsuit, upside-down, water, yellow_bikini, yuuhi_(yuyuhihi)