In his first life, he was the legendary hero who achieved the impossible, slaying the Demon King. But his reward wasn't glory, it was betrayal. Feared by the gods who ruled the world, they conspired to strike him down, murdering him without mercy. But Kai's soul managed to reincarnate in a modern and ordinary Japan. However, after a tragic accident on Earth, Kai returns to the world where he was once killed. Lyla, the tenth goddess and the only one who didn't betray him, never stopped watching him, she has waited for this moment for centuries. Her love is as vast as the universe... and just as dangerous. To protect her favorite, she has sacrificed her power to grant him a tool never seen before, The System. Now, Kai and Lyla must navigate a world fractured into nineteen kingdoms, dominated by the religions of the other nine corrupt gods who feast on the faith of the masses. With an obsessive goddess by his side and a power that grows constantly, Kai begins his grand revenge.