1girl, bikini, black_ribbon, blue_sky, breasts, brown_hair, closed_mouth, cloud, day, flat_chest, green_eyes, hair_ribbon, hiroki_(yyqw7151), hisakawa_nagi, idolmaster, idolmaster_cinderella_girls, long_hair, looking_at_viewer, low_twintails, navel, ribbon, side-tie_bikini_bottom, sky, solo, swimsuit, twintails, white_bikini