~~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...
A generation of Idaten softened 
by the comfort of peacetime...
جيل من الإيداتين لانت قوّتهم بسبب رخاء السّلام
Eine Generation Idaten,
die der Frieden verweichlicht hat.
Idaten de una generación inexperta
y atontada por la paz.
Idaten de una generación inexperta
y atontada por la paz.
Leur génération ne connaît que la paix
et n’a aucune expérience du combat.
Una generazione di Idaten che
si sono rammolliti per via della pace...
Uma geração Idaten que
amoleceu pela falta de batalha...
Мирное поколение идатэнов,
которые не знают настоящей войны.