A dishonorable thief escorts a mysterious girl to a location she seeks. They're joined by a knight aiming to avenge his executed father, who imposes a condition that becomes his new goal.

The story first starts off around Favaro Leone who is a bounty hunter, collecting money off of bounties he collects (demons). Favaro Leone soon runs into Amira who has no clue what is really going on besides the fact that she must go to "Hellheim", a place where she can go meet her mother. Favaro Leone is then dragged onto this whole quest with her because she had cast a "contract spell" where he now has a demon tail and the only way to get it off is by completing his side of the deal.—Cypher

Favaro Leone, a thief with absolutely no honor and no self-esteem is asked by a mysterious girl to take her to a place this one mentioned to have bent. Followed by a knight who wishes to fulfill his duty as a knight and avenge his hanged father, he imposes the girl one condition that will become his burden and his new aim.—Pel Par

In the past, humans, demons and gods fought together against the mythical creature called Bahamut, a creature strong enough that even gods and demons were terrified. However, in eons-long fight, gods and demons were able to achieve a tragic victory by sacrificing the rulers of gods and demons; thanks to their sacrifice the two keys were created to seal the monstrosity: the demon key and the god key. At the present day, the three fractions are not that close anymore and are trying to seize superiority. One day, a mysterious woman steals the part of the god's key; balance is disrupted. Rage of Bahamut: Genesis focuses on a group of very unlikely heroes to save the world from its imminent destruction.—Scientiiaa