5100 years ago, the Demon King was vanquished by the combined forces of the human empire and the races. With peace settling in the humans enslaved the races. The slaves taking care of everything the humans started living a luxurious life, free from worry and war.

They made only one mistake. Thinking the demons would now been in dismay, they left them to fall apart. Until now there was no sign of them moving. But the peace won't last long, a new king has emerged and unified the Demon Kingdom.

The humans drowning in comfort and earthly pleasures have no idea of the revenge which is slowly creeping to their very gates.