Schwarz Ragnarok Vol. 1

The world will be saved… in exchange for the younger sister’s life.
The black guardian Gram continues to fight in order to protect his only relative, his younger sister…because she offered her life up as a sacrifice. In the wake of a disaster that couldn’t possibly be resisted with human powers, could a quiet soldier have stumbled upon the only answer…?
In a vividly drawn night, a terrible reality and man’s work surface. Dawn breaks on a new dark fantasy: Schwarz Ragnarok!