1girl, ahoge, ashinagi_(bijutu1), ass, back, bare_back, beach_towel, bikini, black_hair, blush, breasts, closed_mouth, dimples_of_venus, idolmaster, idolmaster_cinderella_girls, kohinata_miho, looking_at_viewer, looking_back, lying, medium_breasts, on_stomach, sand, short_hair, shoulder_blades, sideboob, solo, sweatdrop, swimsuit, towel, untied_bikini, yellow_eyes