Kyon, a hybrid of an archangel and demon queen, lives in secrecy as a human until his 21st birthday when he is killed by the demon Prince Beelzebub but is unexpectedly resurrected by his angelic half Levi. Kyon defeats Beelzebub, drawing the attention of God who views him as a threat. With Lucifer's help, Kyon uncovers his heritage, struggles with his conflicting nature, and navigates celestial politics. As Kyon's powers grow, he must choose between embracing his destiny as the Angel of Darkness or succumbing to those who seek his destruction, shaping the fate of the world in a tale of redemption and self-discovery.