1girl alternate_costume blonde_hair book brown_eyes chair collarbone commentary desk futaba_anzu glasses highres holding holding_pencil idolmaster idolmaster_cinderella_girls kinako_(shiratama_mochi) left-handed long_hair long_sleeves looking_down low_twintails neckerchief pencil pink-framed_eyewear pleated_skirt school_desk school_uniform serafuku sitting skirt solo twintails uniform writing