Aki Toyosaki (????, Toyosaki Aki, born October 28, 1986) is a Japanese seiy? and singer born in Tokushima, Japan. She is best known for her roles in Shugo Chara! and Kenk? Zenrakei Suieibu Umish?. Her career as a musician began with her performance of the opening and ending themes of the anime series K-On! in April 2009. In the same month, she and three other voice actresses debuted as the musical group Sphere with their album “Future Stream”.