Kei Maeda is a Japanese voice actress known primarily for her work in adult visual novels and games. She was born on December 22 and is from Saitama Prefecture. As a freelance talent formerly affiliated with Power Rise, she is also known by the stage name Aji Sanma, which she uses for her work in adult games and anime. This pseudonym, which translates to elements of "horse mackerel" and "Pacific saury," was a spontaneous choice made the night before her first audition because she thought it sounded cute. Fans often refer to her by the nickname Ajiko.

Maeda made her debut as a voice actress in 2008 after winning an audition for the main role of Touko Kuchiki in the visual novel Kara no Shoujo, known in English as The Girl in the Shell. She would go on to reprise this role for the 2010 hentai OVA series adaptation of the game, which was animated by Flavors Soft. This performance remains one of her most celebrated works. Following this debut, she focused largely on the adult game industry, bringing to life a wide variety of leading and supporting characters. Among her other notable roles are Minato Mitsuha in Atori no Sora to Shinchu no Tsuki, Nozomi Tokimori in Gangsta Republica, and characters in other titles such as Kisaragi Gold Lamé and Senren Banka. Her voice acting has also extended to general audience games, drama CDs, and web radio shows.

Throughout her career, Maeda has been recognized for her expressive voice and nuanced acting, building a strong reputation within the visual novel community. Beyond voice acting, she has performed theme songs for games she has starred in and has made appearances at events and concerts. In 2020, she launched a YouTube channel titled Ajiko no Ouchi to further connect with her audience and share content in a more personal, spontaneous manner. Her work on internet radio and her social media presence have also endeared her to fans, who appreciate her playful and energetic personality.