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1girl, black thighhighs, breasts, brown footwear, elbow gloves, from behind, gloves, hands on floor, highres, idol heroes (idolmaster), idolmaster, idolmaster million live!, jack-o' challenge, medium breasts, midriff peek, miniskirt, nanao yuriko, navel, no bra, panties, pantyshot, rauto, shirt, short sleeves, simple background, skirt, solo, spread legs, thighhighs, thighs, tiptoes, trembling, underboob, underwear, white panties, white shirt, white skirt