oku (okumen), hagiwara yukiho, kikuchi makoto, idolmaster, idolmaster (classic), 2girls, antenna hair, arm support, ass, bandeau, bare shoulders, bikini, black hair, blue eyes, breasts, brown eyes, brown hair, cleavage, front-tie top, halterneck, indoors, leg up, legs up, midriff, multiple girls, navel, open mouth, short hair, sitting, smile, strapless, strapless bikini, swimsuit, tube top, white bikini, window