~~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...
Say, Ysley, how long are you 
going to study that dead monster?
يسلي، إلى متى ستدرس هذا الوحش الميّت؟
Och, Ysley … Wie lange willst du
noch das tote Vieh begaffen?
Ysley, ¿cuándo dejarás
de examinar el cadáver del demonio?
Ysley, ¿cuándo dejarás
de examinar el cadáver del demonio?
Dis, Ysley, t’as pas fini d’examiner
ce cadavre de démon ?
Senti, Ysley, per quanto devi studiare
ancora quel mostro morto?
Ei, Ysley, até quando vai ficar
investigando o corpo do monstro?
Эй, Исли, долго ты будешь разглядывать
тушу этого демона?