1girl, o, bikini, breasts, cleavage, collarbone, gokineko_(roachcat), halterneck, head_tilt, horizon, idolmaster, idolmaster_shiny_colors, komiya_kaho, looking_at_viewer, navel, ocean, outdoors, red_eyes, red_hair, side-tie_bikini_bottom, small_breasts, solo, string_bikini, swimsuit, wet, wet_hair, white_bikini