 A long time ago, an ordinary sword was soaked with blood through the endless battles of its era, causing the sword to be corrupted and becoming sentient by its own, which earned it the name "Soul Edge".No one dared to wield the sword without getting corrupted by its evil spirit, and only the Hero King, Algol can wield it without getting possessed.However, Algol's son, jealous of his father's feat, wielded the sword and became corrupted.