1girl, bed_sheet, blush, ear_piercing, fang, from_side, hair_over_one_eye, holding, idolmaster, idolmaster_cinderella_girls, looking_at_viewer, monochrome, naked_sheet, open_mouth, piercing, sakaki_imasato, shirasaka_koume, short_hair, simple_background, sitting, sketch, slit_pupils, smile, solo, white_background