1girl, arisugawa_natsuha, black_bra, black_skirt, black_thighhighs, blue_eyes, bra, breasts, button_gap, expressionless, gym, highres, idolmaster, idolmaster_shiny_colors, idolmaster_shiny_colors_song_for_prism, looking_at_viewer, lying, office_lady, on_back, orange_hair, pencil_skirt, shirt, shougun_(chuckni1), skirt, solo, thighhighs, thighs, underwear, white_shirt