~~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...
He'll be ready to move out 
as soon as he's awake.
سيكون جاهزاً للتحرك حالما يستيقظ
Sobald er wach ist,
wird er rauskommen können.
Podrá salir en cuanto despierte.
Podrá salir en cuanto despierte.
Une fois réveillé,
il sera prêt à surgir à tout instant.
Non appena si sveglierà, sarà in grado di muoversi.
Se ele despertar, deverá aparecer já, já.
Он должен вылезти сразу же,
как только проснётся.