Two Certain Dragon Emperors (Toaru Majutsu no Index x Highschool DxD) - Book 1

Accelerator and Kamijou Touma. Two sides of the same coin. As WW3 hits its peak stage and the two heroes face battles they can't afford to lose, something unthinkable happens. "Welcome, Touma, Accelerator. For you are now in a new world." Somewhere else, the Heavenly Dragons' hosts fell, victim of cruel fates. Now tha...