1girl, arisugawa_natsuha, bikini, blue_bikini, blurry, blurry_background, breasts, cleavage, halterneck, hat, holding, holding_removed_eyewear, idolmaster, idolmaster_shiny_colors, large_breasts, leaning_forward, long_hair, looking_at_viewer, navel, orange_hair, outdoors, side-tie_bikini_bottom, smile, solo, string_bikini, sun_hat, sunglasses, swimsuit, tachibana_wataru_(123tsuki), unworn_eyewear, very_long_hair, wavy_hair