1girl :d arm_up armpits asanagi blush center_opening chain cleavage_cutout clothing_cutout collar commentary_request cover cuffs elbow_gloves fang gloves greyscale hair_ornament hairclip heart_cutout idolmaster idolmaster_cinderella_girls koshimizu_sachiko midriff monochrome navel open_mouth short_hair skirt smile solo sweat thighhighs wings