Killed during a half-botched mission, Daisuke finds himself an unwitting part of a very strict Devil's peerage. What's a former Exorcist to do when he's unwillingly turned against old friends and befriending old enemies? An unknown heritage awaits him as he makes his way into unknown territory, all while scratching his head, muttering, "Who did I piss off to get thrown into this?"

It's said that Humans are the Biblical God's favored creations. If that's so, then why are they the ones to suffer when the supernatural do battle? Why are they the ones without the strength to defend themselves? No more. We are the ones who shall defend those who cannot do so themselves. Humanity has been in the crossfire long enough. We are Humanity's shield. We are the Aegis.

Every story has a Hero, someone who saves the day without a thought to compensation or thanks, and does so without hesitation. This story, however, has two Heroes. Two unscrupulous Heroes who leave quite a bit to be desired. One's a dick and the other's a pervert. Being good at heart only gets you so far... Their enemies won't know what hit 'em, those poor fools...

Hatred. Jealousy. Fear. Festering diseases that run rampant and uncontrolled in society. No matter who tries to fight them, they are trampled underfoot by those who unknowingly champion the Cycle. Only one can cure them: a Dragon, a Sacrifice, a Transmigrant. He is all of these things. But he cannot do it alone. With comrades next to him, this is his Crucible, his sole task.