~~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...
humanity was pushed to 
the brink of extinction.
دُفعت البشرية إلى حافّة الانقراض
befand sich die Menschheit
kurz vor ihrer Auslöschung.
la humanidad se vio
al borde de la extinción.
la humanidad se vio
al borde de la extinción.
L’humanité était sur le point
d’être anéantie.
l'umanità venne portata sull'orlo dell'estinzione.
a humanidade foi pressionada
até à beira de sua extinção.
человечество оказалось
на грани истребления.