Eufonius is a Japanese music group which has produced songs for various anime and video games, such as Kashimashi, Himawari!, Noein, and Key's visual novel Clannad. The vocalist is Riya. Members · - composition and arrangement (and sometimes lyrics) · Riya - lyrics and vocals · - supporting member Discography Major releases Singles · (Released October 21 2004) · ? TV anime Futakoi opening theme · ? TV anime Futakoi ending theme · · · (Released April 27 2005) · ? TV anime Futakoi Alternative ending theme · · Idea (Released November 2 2005) · "Idea" ? TV anime Noein opening theme · "eidos" · "Idea" (off