Sachie Hirai is a Japanese voice actress affiliated with the talent management firm Ken Production. She was born on April 19th in Nara Prefecture, Japan. Her journey into voice acting began with formal training as part of the 11th term at the voice actor training school School Duo, after which she was accepted as a trainee at Ken Production, the agency she continues to be associated with throughout her career.

Hirai's professional debut in animation came in 2011 with a role in the theatrical film Macross Frontier: Sayonara no Tsubasa. The following year, she secured her first role in a television anime series with Space Brothers. The mid-2010s marked a period of consistent work, with Hirai appearing in a wide array of supporting roles. She lent her voice to characters in acclaimed series such as Sound! Euphonium as a concert band member, Joker Game as a servant of the Arisaki family, and Concrete Revolutio as Nana. A significant and long-running role came in 2016 when she began voicing multiple characters for the iconic and enduring anime Sazae-san. Her association with Sazae-san culminated in her being named the official voice of the beloved character Ikura starting in 2025.

Among her notable anime credits are the specific roles referenced by fans. She voiced the character Sarina Sekiguchi in the 2019 television anime adaptation of the Circlet Princess game. She also played the role of Takeya Kukuri, a young boy, in the 2019 animated film Psycho-Pass: Sinners of the System Case.1 - Crime and Punishment. Additionally, she voiced Manatsu Kamiya in the 2014 anime Paradise of Innocence and its subsequent OVA releases.

Beyond these credits, Hirai's body of work demonstrates considerable range. In 2014, she voiced Niiva Lada in Chaika: The Coffin Princess and appeared in LOVE STAGE!!. More recently, in 2024, she was part of the cast for Monogatari Series: Off & Monster Season, voicing the character Nikawa Umikawa. Her talents also extend to the world of video games, where she has voiced characters such as Chloe in Valkyrie Anatomia, Teresia in Kanpani☆Girls, and Marina Ikekura in the popular game Blue Archive, a role she later reprised for the Blue Archive The Animation in 2024. Hirai is also active in dubbing foreign films and television series for Japanese audiences, with credits including The Walking Dead and Magnum P.I..

Throughout her career, Hirai has built a reputation for her versatility and dedication. She is noted for her skill with her native Kansai dialect, a trait that adds authenticity to specific character portrayals. Her colleagues and fans appreciate her ability to seamlessly voice a wide spectrum of characters, from energetic children to complex adults. Her diverse range of personal interests, which include photography, singing, and people-watching, are thought to enrich her character performances and interactions within the industry.