Something evil lurks in the City of Nemeah. Changelings possess ordinary citizens and turn them into horrific monsters with terrible capabilities.

The only group able to deal with this threat is the mysterious Red Brigade. Empowered by the goddess Akali, they gain the strength needed to kill these unfortunate souls. Until a normal guardsman by the name of Siegfried cuts down one of the changelings.

Alone.

As Siegfried battles to protect the people he holds dear from these mindless beasts, he stumbles upon a revelation that shatters his perception of reality. His own body begins to undergo a baffling transformation, yet his human consciousness remains intact.

In a world where heroes and villains wear shifting masks, Siegfried finds himself standing at the crossroads of destiny. To challenge those he once revered as heroes, he must embark on a perilous journey to harness his newfound abilities. Every transformation brings him closer to monstrous power, raising the stakes of his internal struggle as he grapples with his own humanity.