Sister Mayo (シスター・マヨ) (born Sawada Masayo (沢田雅世) is a Japanese musician and vocalist. She's a member of Columbia Music Entertainment's Cyber Nation Network and Project.R as well as a solo artist. She is best known as the vocalist for the various opening and ending themes of Hare+Guu and the ending theme of Mahou Sentai Magiranger.

(Source: AniDB)