~~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...
All you ever do is read those human books. 
Would it kill you to train a little?
.كلّ ما تفعله هو قراءة هذه الكتب البشريّة
هل يضرّك أن تتدرّب قليلاً؟
Du starrst immer nur in
diese Menschenschinken.
Tú no dejas de leer libros
escritos por humanos.
Tú no dejas de leer libros
escritos por humanos.
Tu passes ta vie à lire
les bouquins des humains.
Tu invece leggi solo quei libri umani.
Mica ti fa male allenarti un po'.
Você só fica lendo esses livros escritos pelos
humanos. Por que não treina de vez em quando?
А ты только и делаешь,
что читаешь людские книги.