1girl, o, anastasia_(idolmaster), bare_arms, bare_shoulders, blue_eyes, blush, breasts, cleavage, hair_between_eyes, idolmaster, idolmaster_cinderella_girls, looking_at_viewer, medium_breasts, naked_towel, night, night_sky, onsen, open_mouth, outdoors, rum_raisin_(chihiromakita19), short_hair, sideboob, sky, solo, steam, towel, tree, water, wet, wet_hair, wet_towel, white_hair