Keiko Takahashi is a Japanese actress primarily known for her extensive work in live-action film and television. She was born on January 22, 1955, in Shibecha, Hokkaido, Japan. She began her career in 1970 under her maiden name, Keiko Sekine, debuting in the film High School Student Blues. Early in her career, she received the Golden Arrow Award for Newcomer of the Year for her performance in the 1970 film Osanazama. She married film director Banmei Takahashi in 1982 and has since been credited as Keiko Takahashi.

While her career has spanned several decades and includes dozens of roles, her work as a voice actor in anime is limited. She is confirmed to have provided the voice for Ai's mother in the 2009 animated film Symphony in August, a role you mentioned. This film is a blend of animation and live-action based on the autobiography of singer-songwriter Ai Kawashima. Outside of this single, notable role in an animated feature, there is no widely documented information about her having a broader career as a voice actor in anime, nor are there records of recurring collaborations with specific anime directors or studios. Her professional achievements are overwhelmingly in live-action cinema, where she has received critical recognition, including the Mainichi Film Award for Best Supporting Actress in 2008 and the Mainichi Film Tanaka Kinuyo Award in 2010.