1girl, bare_arms, bare_shoulders, breasts, brown_eyes, dress, from_side, hair_intakes, hair_ornament, hairclip, idolmaster, idolmaster_cinderella_girls, koshimizu_sachiko, purple_hair, sakaki_imasato, short_hair, sitting, sleepwear, small_breasts, smile, solo, spaghetti_strap, white_background