4girls, anastasia_(idolmaster), architecture, arm_hug, blue_eyes, blue_sky, blush, brown_hair, collarbone, day, dot_nose, east_asian_architecture, fang, green_eyes, grey_hair, hair_over_one_eye, idolmaster, idolmaster_cinderella_girls, kanzaki_ranko, looking_at_viewer, maekawa_miku, multiple_girls, naked_towel, onsen, open_mouth, outdoors, partially_submerged, pina_korata, popon_ta, red_eyes, rock, rubber_duck, shirasaka_koume, short_hair, sky, smile, steam, surprised, towel, two_side_up, wading, wooden_wall