1girl, o, armlet, bikini, blue_hair, blunt_bangs, bracelet, breasts, cleavage, collarbone, dark_blue_hair, frilled_bikini, frills, green_bikini, groin, idolmaster, idolmaster_million_live!, jewelry, knees_up, looking_at_viewer, lying, medium_breasts, nanao_yuriko, nashiki_053, navel, on_back, simple_background, solo, swimsuit, thigh_strap