Takahashi released her first and only solo single to date, "Yume Kara Samete". Following then-leader Hitomi Yoshizawa's graduation from Morning Musume on May 6, 2007, sub-leader Miki Fujimoto was promoted to leader and Takahashi filled in as the new sub-leader of the group. On June 1, 2007, Fujimoto resigned and Takahashi took over as the new leader. Takahashi was also captain of the Hello! Project kickball team, Metro Rabbits H.P. In 2008, Takahashi became a member of Hello Project's new unit High-King, a group created to promote Morning Musume's Cinderella the Musical, in which Takahashi played the title character. It was announced in July 2008 that Takahashi and fellow Morning Musume member Risa Niigaki would play the 80s J-Pop duo Pink Lady in the TV Drama Hitmaker Aku Yuu Monogatari. As of January 2009, she and Risa Niigaki had the longest tenures of any member; she was one of only seven members to remain in the group for seven years or more (the others being Kaori Iida, Yoshizawa, Niigaki, Eri Kamei, Sayumi Michishige and Reina Tanaka) and one of two (along with Niigaki) to remain in the group for eight or nine years. On February 1, 2009, during the "Hello Pro Award '09 ~Elder Club Sotsugyō Kinen Special~" concert held at Yokohama Arena, Yuko Nakazawa passed on her leadership position in Hello! Project to Takahashi. In December 2009, Takahashi was one of many celebrities to promote the release of Final Fantasy XIII in Japan. In September 2010, she became the second Morning Musume member to be at least 24 years old and the first to reach that age while in the group (original member Yuko Nakazawa was 24 when the group was formed). On January 9, 2011, it was announced that Takahashi would graduate from Morning Musume at the end of the fall tour that year. Takahashi's last single with Morning Musume, the double A-side "Kono Chikyuu no Heiwa wo Honki de Negatterun dayo!/ Kare to Issho ni Omise ga Shitai" (この地球の平和を本気で願ってるんだよ！/彼と一緒にお店がしたい！), included a B-side solo by Takahashi, "Jishin Motte Yume o Motte Tobitatsu Kara" (自信持って 夢を持って 飛び立つから), and was released on her birthday, September 14. On September 30, 2011, on the last day of Morning Musume's "Ai Believe" tour, Takahashi graduated from Morning Musume and Hello! Project at the Nippon Budokan and passed her role of leader to Risa Niigaki. Post Morning Musume (2011–present) 2011Her first role after graduation