+_+, 3girls, ass, bad_pixiv_id, beach, bikini, bikini_under_clothes, blue_sky, blush, breasts, brown_hair, cleavage, cloud, cutoffs, day, denim, denim_shorts, dolphin_shorts, flip-flops, foot_out_of_frame, hair_intakes, himekawa_yuki, hino_akane_(idolmaster), idolmaster, idolmaster_cinderella_girls, kneeling, legs, looking_at_viewer, medium_breasts, multiple_girls, navel, orange_hair, outdoors, panties, panty_peek, ponytail, red_bikini, sandals, see-through, see-through_shirt, shirt, shorts, side-tie_bikini_bottom, sky, smile, solo_focus, splashing, striped, striped_bikini, swimsuit, tied_shirt, trente, twitter_username, underwear, v, wading, wakabayashi_tomoka, water_gun, white_shirt