Ruppina

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 first debuted under the name Ruppina, which became the identity most closely associated with her early work and her anime-related releases. She is a talent of the Fit One management company and is part of the artists' roster of Rhythm Zone, a label owned by Avex Entertainment Inc. That placement situates her within the broader J-pop landscape shaped by Avex-affiliated acts, while her recordings under Ruppina remain the most notable reference point for listeners searching for her music. As Ruppina, she recorded the songs "Free Will" and "FAITH," both of which were selected for the Japanese anime series One Piece. "Free Will" served as the 10th ending theme, while "FAITH" was used as the 11th ending theme, giving her a clear connection to one of the most internationally recognized anime franchises. For fans looking up Ruppina, the name refers to Mai Kudo's anime-linked J-pop project and to the songs that introduced her to many anime music listeners. Her career is especially remembered through these One Piece ending themes, which remain the key works associated with her artist profile.