1girl, arisugawa_natsuha, bare_shoulders, bikini, black_eyes, bracelet, breasts, cleavage, crop_top, earrings, hair_ornament, hairclip, idolmaster, idolmaster_shiny_colors, jewelry, large_breasts, long_hair, looking_at_viewer, midriff, navel, orange_hair, shallow_water, solo, stomach, swept_bangs, swimsuit, water, yamabuki_ryuu, yellow_bikini