2girls, accidental exposure, ass, bag, brown hair, clothes lift, facing away, from behind, grey background, grey skirt, hands in pockets, idolmaster, idolmaster cinderella girls, long hair, long sleeves, miniskirt, multiple girls, panties, rukitsura, school bag, shibuya rin, shimamura uzuki, simple background, skirt, skirt lift, socks, thighs, trefoil, underwear, wardrobe malfunction, white panties