Shakugan no Shana 3.

More about the book

Yuji has just started a new semester of high school and everything seems to be normal. That all changes when a mysterious man named Friagne begins turning people into blue flames. And wouldn't you know it? Now he's after poor Yuji To the rescue comes a girl named Shana. But is she too late? As it turns out, young Yuji may already be dead. What the heck is going on? A mysterious high school story written by Yashichiro Yakahashi. Friagne abducts Yuji as a decoy to get at Shana, and as a Flame Haze, Shana has no choice but to come to the rescue. Will she foil Friagne's plan to activate the Devourer of the City? Or is it the end for Shana and Yuji?