Kozuki is 174 cm tall. When she gained the top star status of Star Troupe, where she started her Takarazuka career, she became the tallest of top stars of the five troupes in 2003 Because of her height, she provided a strong male image on the stage. She progressed gradually after graduating from the New Actor Show cast. One of her notable roles in the 1990s is Lord Henry Wotton of The Picture of Dorian Gray. In 1997, she got her first Takarazuka Bow Hall show (Angels at Dawn).
One of the characteristics of her Takarazuka career is that she had participated in the most overseas performances among her generation: New York City in 1992, London in 1994, Hong Kong in 1998 and Seoul in 2005 (performing Rose of Versailles as a part of the celebration of the establishment of Japan-Korea relationship).
Upon the founding the Cosmos Troupe, she participated in her second production of Elisabeth in 1998 and got great applause with her portrayal of Luigi Lucheni (she played Elmer Batthyany in the 1996-7 Star Troupe production). In the 1998 production of Wuthering Heights, she had the role of Edgar in the previous Snow production, who later succeeded her to be the top star of Star Troupe). During the founding era of Cosmos, she got her second Bow Hall lead (The Tempest, as a part of Bow Shakespeare Series) in 1999.
During her Senka era, she participated in the production of Cosmos, Star, Snow and Moon. Also, she got a lead of show at the Tokyo special performance Singing in the Midnight (a production of Snow Troupe). Joining her as female lead was Hikaru Asami, a former troupe mate of Cosmos. When she participated in the Senka-Flower and Senka-Snow production of Gone with the Wind in 2002, she became the first to be in all five troupe productions in the company.
In 2003, she performed in A Song for Kingdoms (Takarazuka's own version of Aida), and in 2005 Rose of Versailles and Soul of Sheba in Korea. Too Short a Time to Fall in Love and Neo Dandyism! followed the next year, when she resigned from Takarazuka. Her first performance after the resignation, in the same year, was the Japanese production of Damn Yankees as Lola.
