January 11, 1961
Mutsumi enrolled in the Takarazuka Music School in 1976, and when she graduated, she joined the Flower Troupe under the name Yuki Tsubasa (翼悠貴, Tsubasa Yuki). She was a member until 1985.
She has a sister who is a singer-songwriter, and a brother who is a musician.
- Her blood type is A.
- Her height is 167cm or 5'6".