Devils were tempted by ballad of anima...

The chaotic lands of Dolgar. A continent of turmoil and war.
Various types of battle for power, conquest for the right to rule.
... and among those species, reigning supreme are the Orcs.
Worshiping the god of violence, "Dorgan Nof",
the orcs got great powers by making a pact with the Demon Lord
and all other species bowed before their might as slaves and livestock.
Tormented for their pleasure, no mercy, no compassion. Only despair ...
---- 1000 years ago, a similar invasion of the human lands was
thwarted by a savior, a hero that made a pact with the Demon Lord's
younger sister and saved all humanity.
She once disappeared in the ebb and flow of history ...
but has returned to bask in the limelight once more.
To destroy the ambitions of the Demon Lord and Orcish King!