was a Japanese actress and singer. She was born as Masako Kobayashi in Nagano, Nagano Prefecture. She married in 1903 but soon got a divorce. He married again in 1908 but this was also unsuccessful. She started a love affair with Hogetsu Shimamura. Shimamura requested Shinpei Nakayama to make her song, titled "Katyusha's Song". This was said to be the first ryūkōka song. After Shimamura died on November 5, 1918, she committed suicide by hanging on January 5, 1919.
Based on her story, the movie "The Love of Sumako the Actress" was
produced in 1947.