The End to Everything, the One Beginning Episode 1

It was a normal day of the life of Sakai Yuuji. When all of the sudden his life changed. When a Monster called "Tomogara" attack him and everyone around him. He was they confused and shocked because everyone around him was turned into a blue flame and being consumed by the monster. Yuuji's life was then saved by a girl in a black coat, with Burning Eyes (Also Known as Shakugan) and a flaming red hair holding a long sword. Due to the confusion and chaotic mess, yuuji got into. He follows the girl with flaming red hair and finds out the truth about everything around him.