kousaka kirino, ore no imouto ga konna ni kawaii wake ga nai, game cg, official art, 1girl, :<, aqua bikini, arms behind back, ass, back, barefoot, bikini, brown hair, closed mouth, dutch angle, embarrassed, eyewear on head, frown, hair ornament, hairclip, halterneck, long hair, looking back, pool, pool ladder, poolside, side-tie bikini bottom, solo, string bikini, sunglasses, swimsuit, v-shaped eyebrows, water