Sumi Shimamoto, real name Sumi Koshikawa, is a Japanese actress, voice actress and narrator of film and anime and video games. After graduating from the Toho Gakuen College of Drama and Music, she joined Gekidan Seinenza, a theatrical acting troupe. She is currently independent of any talent management company. She is married to Daisuke Koshikawa, one of the founders of the comedy troupe Chibikko Gang. Their first child, Shiori, has also done voice acting.