Ruppina is the stage name of Mai (舞), also credited as Mai Kudo (工藤 舞, Kudou Mai; born July 18, 1984), a J-pop singer from Hokkaido, Japan. She debuted under the name Ruppina and was a talent of Fit One management company and part of the artists' roster of Rhythm Zone, a label owned by Avex Entertainment Inc.
As Ruppina, she recorded "Free Will" and "FAITH," both selected for the Japanese anime series One Piece. "Free Will" was the 10th ending theme, and "FAITH" was the 11th ending theme.
