1girl, o, bed_sheet, blush, bra, breasts, cleavage, collarbone, gameso, idolmaster, idolmaster_shiny_colors, lace-trimmed_bra, lace_trim, light_brown_hair, looking_at_viewer, lying, medium_breasts, medium_hair, navel, on_back, pillow, pink_bra, sakuragi_mano, solo, underwear, upper_body