1girl, ame_(uten_cancel), arisugawa_natsuha, bare_arms, bare_shoulders, bikini, blue_sky, blush, breasts, brown_eyes, character_name, day, fingernails, from_side, holding, idolmaster, idolmaster_shiny_colors, inflatable_toy, innertube, long_hair, looking_at_viewer, medium_breasts, nail_polish, navel, ocean, one_eye_closed, outdoors, own_hands_together, parted_lips, red_hair, shiny_clothes, side-tie_bikini_bottom, sideboob, simple_background, sky, smile, solo, stomach, swimsuit, teeth, thighs, water, water_drop