Rumiko Koyanagi, formerly known as Rumi Natsukawa during her Takarazuka Revue days, is a Japanese actress and singer. She began her career as a member of Takarazuka Revue. She won the award for best new artist at the 13th Japan Record Awards and won the Japan Music Award in 1972. She won the award for best supporting actress at the 6th Japan Academy Prize for To Trap a Kidnapper and the award for best actress at the 7th Japan Academy Prize for Hakujasho.