In a world brimming with ancient secrets and powerful pendants that harbor forbidden forces over time and fate-sealed away for humanity's safety-clashing powers and ideals collide. A shadowy organization lurking in the church's shadow seeks to exploit these forces, drawing in an ordinary high school boy named Aku. His life was once simple: friends, first true love, and carefree adventures. But an ancient curse in the form of a necklace shatters it all. To some, such power might be a blessing, but Aku yearns only for a normal, peaceful existence. Instead, the inherited force hurls him into an endless cycle of death, grief, and regret.
Hunted by the organization coveting his power, Aku loses everything he holds dear. A tragic twist of fate ignites a raging fire of vengeance within him. Driven by hatred, he aims to eradicate the world's evil-unaware that he's becoming the very monster he despises.