1girl, barefoot, black_shorts, bra, breasts, brown_bra, brown_eyes, brown_hair, hiroki_(yyqw7151), idolmaster, idolmaster_shiny_colors, looking_at_viewer, lying, medium_breasts, medium_hair, navel, on_back, osaki_tenka, parted_lips, plaid, plaid_bra, short_shorts, shorts, simple_background, solo, thighs, toes, underwear, white_background