After rebelling against the Lord's will, Lucifer, an Archangel and previous chief of the Seven Heavenly Virtues, is expelled from Heaven. She is stopped halfway between Heaven and Hell after smashing through the roof of a high school chapel while falling from the sky. Despite the fact that she is watched by Maria Totsuka, a soft-spoken student at the institution, Lucifer continues her slide into Hell. Lucifer is discovered soon after her arrival by ambitious Demon Lord and fangirl Leviathan. The two decide to topple the Seven Sins, Hell's ruling council led by Belial. The Seven Sins, however, are able to resist Lucifer and confine her celestial abilities by draping a Garb of Punishment over her body.