niban (puka 0507), ohtsuki yui, idolmaster, idolmaster cinderella girls, commentary request, highres, 1girl, bikini, black bikini, blonde hair, blue eyes, blush, breasts, cleavage, gluteal fold, grey shrug, groin, hood, hoodie, large breasts, long hair, long sleeves, looking at viewer, navel, one eye closed, open mouth, shrug (clothing), side-tie bikini bottom, smile, solo, swimsuit, thighs, wavy hair, wavy sidelocks