Ayumi Shigemori is a Japanese actress and singer best known for her extensive work in children's entertainment, particularly as a long-running "Uta no Oneesan," or singing sister, on the beloved NHK program Okaasan to Issho. Born on December 15, 1971, in Kumamoto, Japan, her career has been primarily defined by her musical performances and television appearances, with voice acting representing a smaller facet of her professional work.

Shigemori's career began in 1993 when she was selected to be the 17th "Uta no Oneesan" on Okaasan to Issho, a role she would hold for six years. During her tenure on the program, she performed alongside "Uta no Oniisan" Kentaro Hayashi and became a household name. Her most significant achievement from this period was the release of the song Dango 3 Kyodai in 1999. The song became a massive commercial success and a social phenomenon in Japan, bringing her widespread recognition. Her background in vocal music, piano, and ballet, cultivated from a young age, supported her performance career. Following her time on the program, she continued her career as a solo singer and stage actress, with credits in productions such as Star Prince and Threepenny Opera, and also released an album of Disney song covers.

While primarily a television personality and singer, Shigemori has taken on some acting roles that include voice work. As noted, she provided a voice for the 2001 television anime special 21 Seiki Manga Hajimete Monogatari. This anthology series, produced by Tokyo Kids, featured her as a cast member, credited alongside other voice actors such as Yuko Tsuga and Etsuko Kozakura. Information about the specific character she played, referred to as "Onee-san" or older sister, is not detailed in the available records. In addition to this voice role, her other acting credits include a part in the 2000 live-action film Kamen Gakuen, where she played the character Hiromi Nosaka.

Information on recurring collaborations with specific directors or studios is not readily available. Her most notable and sustained professional relationship was with NHK, the broadcaster of Okaasan to Issho, where she also appeared in later programs such as the puppet show Quintet. Her lasting achievement remains her impact on children's entertainment in Japan and her contribution to one of the country's most famous children's songs.