Seven archangels guide the fate of humanity: the angels of life, death, miracles, nature, progress, free will, and emotions. When Violet, the angel of emotions, renounces her ministry, her actions prompt a series of events that will bring the end of the world as we know it. As Violet is punished and condemned to be bonded to a human named Ruth, a reluctant prophet, they uncover a demonic plot to bring upon the end of the world. One by one, the seven archangels fall prey to attacks from the Deadly Seven, a group of powerful arch-demons that personify each of the seven deadly sins. With the impending destruction of humanity growing near, Violet and her human friend are tested as they must rely solely on one another to rescue the rest of the archangels while leading the fight against the Deadly Seven demons.