Kreisia―A world of three races coexisting under
the banner of single kingdom. Yet notwithstanding
these different people being ruled over by a lone
institution of government, life, for the most part,
has continued on peacefully despite certain racial
undertones pervading the hearts of some in society...

Yet not forgotten is the re-emerging calamity
precipitated by the Overlord with each new decade...
Resurrecting once every ten years, this personification
of evil sets about to envelop the world in chaos and
destruction.

And now having arrived at that time, the people of
this world have begun preparing to summon a Savior
from the outer realmーa place beyond the bounds
and the imagination of those in Kreisia.