To live or to die? In order to survive mankind will have to make a deal with the devil himself! When Japan is driven to the brink of despair by mysterious invaders called the Septentriones, humanity fights back using Devil Summoners, 13 people of great distinction who have made pacts with demons and been given the power to fight! This is the story where comrades’ deaths can be foretold, where mankind has been placed in the harshest of situations, a story of conflict and choices. Will they be able to survive the countdown to Armageddon?!