Favaro Leone travels the land, collecting bounties while avoiding a rival bounty hunter; his life changes when he encounters a mysterious girl from the sky.

Favaro tries everything possible to remove his newly-acquired demon tail; an elite band of knights is sent to retreive Amira's God Key.

While humans, gods, and demons pursue the God Key, Amira and Favaro venture into a small town covered in a mysterious, eerie fog.

After receiving a helpful tip from Bacchus, Favaro and Amira finally board a boat headed for Helheim; its captain is an old friend of Favaro's father.

Favaro and Rita try to find a way into Azazel's flying castle, where Amira and Kaisar are being held prisoner.

Favaro, Amira, and the others are captured and taken to the royal city of Anatae; truths are revealed and executions are prepared.