1girl, bad_pixiv_id, blue_eyes, blue_one-piece_swimsuit, blue_sky, breasts, cloud, covered_navel, cowboy_shot, grey_hair, hisakawa_hayate, horizon, idolmaster, idolmaster_cinderella_girls, long_hair, looking_at_viewer, medium_breasts, ocean, old_school_swimsuit, one-piece_swimsuit, outdoors, rfeulgen, school_swimsuit, sitting, sky, solo, swimsuit, thighs