~~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...
considering how surprised he was that 
I survived having my heart pierced...
...نظراً إلى أنه تفاجأ عندما نجوتُ بعد اختراق قلبي
Er schien reichlich überrascht,
dass ich ohne Herz noch lebe.
Le sorprendió que no muriera
al atravesarme el corazón.
Le sorprendió que no muriera
al atravesarme el corazón.
Il était surpris
que je puisse survivre sans cœur.
visto che si è sorpreso per il fatto che sono
ancora vivo dopo che mi è stato trapassato il cuore.
pois ele ficou espantado comigo vivo
mesmo depois de atacarem meu coração...
если судить по тому, как он удивился,
что я выжил лишившись сердца.