Cecilia

Virtual Butler Cecilia (バーチャル執事Cecilia BAACHARU Shitsuji Cecilia), also known as Sister-Brother Cecilia (Cecilia姉貴兄貴 Cecilia Aneki Aniki) as of 2020, is a Virtual YouTuber that "reproduces music by voice". They produce a cappella covers that are primarily of songs that are popular in the YTPMV and 音MAD communities, such as "Shibamata", "Lamprey Hole", and "A Sardine Grows from the Soil ".

Further readings

 * Cecilia - Nicovideo Encyclopedia