1girl, arisugawa_natsuha, ass, bikini, blush, breasts, butt_crack, from_behind, hair_ornament, hair_over_shoulder, hair_scrunchie, idolmaster, idolmaster_shiny_colors, leaning_forward, light_smile, looking_at_viewer, looking_back, medium_breasts, o-ring, o-ring_bikini, o_(rakkasei), orange_hair, plant, scrunchie, shoulder_blades, side_ponytail, solo, swimsuit, water, white_bikini