This world was once a civilization brought together by magic and technology.
As civilization advanced, those who possessed the power of technology and magic segregated due to their differences in ideas and formed two separate societies of humans and demons.
The human race continued to develop their civilization with technology, while the demons started to construct their own society with magic.
This balance did not hold for very long, however, and technology was gradually replacing magic.
Soon afterwards, an ultimate weapon from the technological civilization appeared, and in an ironic twist of fate, lost control and destroyed the whole world, along with all civilization therein.
Nearly a thousand years have gone by without incident, until one day the ancient technology lying deep within the Earth was excavated.
Mankind was once again on its way to committing the same mistakes of the past…