1girl, ahoge, arm support, bangs, bow, bowtie, buttons, chestnut mouth, collarbone, dress, expressionless, eyelashes, female child, flat chest, greyscale, hair bow, hosizora mikoto, idolmaster, idolmaster cinderella girls, legs, light blush, long sleeves, looking at viewer, low twintails, messy hair, monochrome, on bed, pillow, sailor collar, short hair, sitting, socks, solo, steam, thigh gap, thighs, twintails, yusa kozue