Shakugan no Shana

It was a normal day in the life of Sakai Yūji, a 15 year-old highschool student, but then all of a sudden his life changed. When a Monster called "Guze no Tomogara" attacks him and everyone around him, turning them into blue flames and consuming them, Yūji's life gets saved by the Flame-Haired Burning-Eyed Hunter. A girl in a black coat, flaming red hair and a long sword, whom he would later name Shana. Confused and seeking answers Yūji follows the girl and finds out the harsh truth about everything around him.