When they were little, Helck and his younger brother Cless lost both of their parents. One day, Cless gets very sick and Helck begs for someone to save him.

Only half a month after Cless departs on his expedition, monsters begin to appear in greater numbers than ever before. The kingdom enacts a military draft to combat them.

Helck arrives at the Demon Lord’s castle and senses a powerful presence. It turns out to be Azudra of the Four Elite Lords, who makes a plea for peace.

Zeruzeon reveals the kingdom’s terrifying plan, so Helck and his friends sneak into the castle to put a stop to it by saving Cless.

Helck is on the verge of being killed. To save the life of his big brother, Cless is forced to make a choice.

Helck charges onward but an army of bounty hunters stands between him and Alicia. She is in horrible shape as she faces public execution.

Helck's motivations become clear with an awakening of a horrific truth. Vermilio vows to fight by Helck’s side.

The winged knights continue attacking Castle Thor to level themselves up further. Meanwhile, Asta keeps snooping for information in the human realm.

Zeruzeon leads the winged knights in an assault on the newly rebuilt castle. Humans and demons become locked in combat.

Hyura and Edil battle it out at Castle Thor while a strange relationship starts between them. Meanwhile, Mikaros is confronted by Azudra and reveals a past grudge.

Raphaed’s army attacks a demonkin outpost, when Helck and Vermilio arrive. Raphaed determines Vermilio is Helck's newfound source of support.

Helck faces off with his former friend, Alicia. Meanwhile, Vermilio can't help but be concerned about Helck as she continues to fight with Raphaed.