寶塚歌劇團
In 2006, Takahashi played the lead role, Sapphire, in "Ribon no Kishi The Musical" which was a collaboration work by Hello! Project and the Japanese all-female theatrical company Takarazuka Revue. The musical was based on Tezuka Osamu's manga and starred v-u-den, Nozomi Tsuji, Aya Matsuura and Natsumi Abe as well as Marcia and Kaoru Ebira of the Takarazuka Revue. On July 2, Takahashi released her first and only solo single to date, "Yume Kara Samete".