Seven Mortal Sins

Lucifer, an Archangel and former leader of the Seven Heavenly Virtues, is cast out of Heaven for defying the Lord's will. As she falls, she crashes through the roof of a high school church, briefly stopping her descent between Heaven and Hell. Maria Totsuka, a quiet student at the school, witnesses her, but Lucifer quickly continues her plunge into Hell. There, she meets Leviathan, an ambitious demon who idolizes her. Together, they plot to overthrow the Seven Sins, Hell's rulers led by Belial. However, the Seven Sins overpower Lucifer and seal her divine powers by forcing her into a Garb of Punishment, turning her into a Demon Lord. Hungry for vengeance, Lucifer returns to Earth with Leviathan, binding Maria as her immortal servant. With her new allies, Lucifer begins her quest to defeat the Seven Sins and break the curse of the Garb.