Haga Keita (芳賀敬太), a Japanese artist is responsible for the lyrics to songs in the Fate/Stay Night soundtrack such as tracks "days", "This Illusion" (the opening theme to the game) and "Ougon no Kagayaki." Haga Keita is the listed artist for the Fate/Stay Night Realta Nua PS2 Game soundtrack, a repackaged version of the original Fate/Stay Night eroge for all ages. Read more on Last.fm