1girl, artist_name, bare_legs, barefoot, bed_sheet, blush, breasts, cleavage, collarbone, idolmaster, idolmaster_cinderella_girls, inoue_sora, knee_up, koshimizu_sachiko, looking_at_viewer, lying, navel, on_back, on_bed, panties, pink_sports_bra, purple_hair, purple_panties, small_breasts, smile, solo, sports_bra, toes, underboob, underwear, underwear_only