~~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...
And I'm able to learn more than 
any human can in their limited lifespan.
وأنا قادر على التعلّم أكثر من أي بشريّ
في عمره المحدود
Ich kann weit mehr Wissen
aufnehmen als die Menschen
Puedo acumular más conocimientos
que cualquier humano en toda su vida.
Puedo acumular más conocimientos
que cualquier humano en toda su vida.
Je peux acquérir
bien plus de connaissances
E sono in grado di imparare più cose di quante
ne possano imparare gli umani nella loro breve vita.
Eu posso aprender muito mais que os humanos
podem, devido à baixa expectativa de vida deles.
Я могу обрести больше знаний,
чем любой человек успеет за свою жизнь.