Ayahi Takagaki is a Japanese actress, voice actress, and singer. She voiced Lucia Nahashi in Venus Versus Virus and debuted as part of the musical group Sphere in 2009 with its single Future Stream. That same year, she performed the opening theme of the anime series First Love Limited. Takagaki has also appeared in the film MOBILE SUIT GUNDAM 00 -Awakening of the Trailblazer- alongside Mamoru Miyano and Hiroshi Kamiya. She has released several singles including Lasting Song, Futurism, and 汐流永恆 (SP鯨汐千姬·式神角色主題曲) with Onmyoji.