~~The following program contains adult themes and scenes of violence and sexual assault that may not be suitable for some viewers and is inappropriate for children. The content is intended for mature audiences only.~~

Centuries ago, vicious and bloodthirsty demons who were immune to all manner of weaponry plagued mankind. Humanity's cries for help brought forth the Idaten; battle deities who would use their incredible speed to hunt the demons down, and then seal them away. In the following 800 years of peace, the Idaten have not had any enemies to fight. But that is about to change...
One of the demons who left a blazing 
trail of carnage 800 years ago,
،أحد الشياطين الّذين خلّفوا آثار مذبحة قبل 800 عام
Einer der Dämonen, die vor 800 Jahren
eine Schneise der Verwüstung hinterlassen haben.
Uno de los demonios que arrasaron
el mundo hace 800 años.
Uno de los demonios que arrasaron
el mundo hace 800 años.
Il y a 800 ans, c’était l’un des démons
qui semaient la dévastation.
Uno dei demoni che 800 anni fa
ha ridotto il mondo in cenere...
Um dos demônios que ateou
fogo no mundo há 800 anos,
Один из демонов, которые устроили
ад на земле восемьсот лет назад.