4girls, asakura_toru, blue_sky, blush, breasts, dress, fukumaru_koito, higuchi_madoka, ichikawa_hinana, idolmaster, idolmaster_shiny_colors, large_breasts, looking_at_viewer, medium_breasts, multiple_girls, noctchill_(idolmaster), nonbire, outdoors, sky, sleeveless, sleeveless_dress, smile, upper_body, white_dress