In a universe divided into four realms—Celestial Concord, Chaos and Conquest, The Beast Realm, and the mysterious Dark Realm—order is maintained by ancient bloodlines, fearsome powers, and sacred hierarchies.
At the heart of the Celestial Concord lies five great families, each blessed with unique and godlike abilities. Among them is the Aphelgustine Family, known as the Sinborns, masters of sin-based martial arts and wielders of the legendary Heptacurse Steps: Dance of the Damned.
Enter Kaine Aphelgustine, a cold and calculated heir of the Aphelgustine bloodline. Burdened by his lineage, feared for the potential locked within his soul, Kaine seeks only to live in the shadows of the great families. But when a duel with a fellow prodigy ignites a chain of events, Kaine is thrust into the heart of conspiracies, rivalries, and ancient secrets buried by time.
As tensions rise between the realms and long-forgotten beings stir in the darkness, Kaine must awaken the true power of his family's cursed legacy—unlocking the Aphelgustine Ring, mastering the sins, and facing enemies that wield chaos, beasts, and void itself.
But power always comes at a price. And some sins… refuse to be controlled.