What meaning can life have after the end of the world?

Guren and his friends are forced to consider this question, even as they fight to rebuild their ruined world--the world that Guren himself destroyed. Dispatched by the newly constituted Japanese Imperial Demon Army on a mission to restore power to the area, they encounter a powerful vampire. But all is not as it seems...
Faced with shifting loyalties and manipulated from all sides, Guren must decide who to trust--Mahiru? Saito? Ferid Bathory? Can he even trust himself? The mysteries of the past slowly begin to unravel as Guren and his friends hurtle towards an uncertain future.