1girl, ajoea, ass, bad_twitter_id, ball, bare_back, bare_shoulders, bikini, breasts, brown_hair, closed_eyes, exercise_ball, flat_chest, hair_ornament, hairclip, idolmaster, idolmaster_cinderella_girls, loli, lying, on_stomach, ryuzaki_kaoru, short_hair, side-tie_bikini_bottom, sleeping, small_breasts, solo, spaghetti_strap, swimsuit, thighs, white_bikini