Why would a girl be trapped in a burning building with her baby brother?

Why would a student be tempted to burn his classmate to death? In the silence that separates this world from any other, a crack has appeared. And it is that crack that calls together a fighter, a tactician, a swordsman, a magician and an expert. Together, they must face impossible odds if anyone is to survive. But beneath the issues, another problem burns. The allure of power is sometimes too great even for the strongest of heart.