Shakugan no Shana X, Shakugan no Shana X Eternal Song, 灼眼のシャナX, 灼眼のシャナX Eternal song -遥かなる歌-, 灼眼的夏娜─永恆之歌─, Shakugan no Shana X Eternal Song – Harukanaru Uta
Set in the 16th century in Europe, this is a prequel story of Shakugan no Shana. In the world where the seals didn’t exist, the Great War burst between the Flame Hazes and the Crimson Denizens. The story centers around Mathilde Saint-Omer, the former “Flame-Haired Burning-Eyed Hunter” and reveals details that haven’t been explained in Shakugan no Shana.