Sei Matobu

is a Japanese actress who is a former Hanagumi Top Star of the Takarazuka Revue. In addition to her stage roles, she has acted for television, feature films, radio and advertisements. She is represented by Watanabe Entertainment. Born in Kawasaki, Kanagawa, she is nicknamed . Sometimes, she was called "Unta" in her early school days. She graduated from Nakanobu Gakuen High School (now Hōyū Gakuin High School).