saitou natsuki, kojima hibiki, kojima keisuke (imouto kansatsu nikki), kojima kirika, imouto kansatsu nikki, imouto kansatsu nikki 2, triangle (company), game cg, 1boy, 2girls, :d, aqua bikini, bikini, black hair, blush, breasts, brown eyes, brown hair, cleavage, cloud, competition swimsuit, day, dutch angle, faceless, faceless male, flat chest, green bikini, innertube, light rays, long hair, medium breasts, multiple girls, one-piece swimsuit, open mouth, outdoors, parasol, pool, poolside, purple eyes, sarong, short twintails, small breasts, smile, splashing, sunbeam, sunlight, swim ring, swimsuit, twintails, umbrella, water