Sin: Nanatsu no Taizai

After Lucifer rebels against Heaven’s will, she is cast from her position as an archangel and falls toward Hell, briefly crossing the human world and meeting a student named Maria. In the depths below, Lucifer discovers that seven demon lords embodying the mortal sins rule Hell under Belial.

Lucifer challenges them with the help of Leviathan, but her defeat leaves her powers sealed and transforms her into a demon lord herself. Refusing to submit, she returns to Earth and draws Maria into the conflict. Together with Leviathan, Lucifer begins a campaign against the Seven Sins, determined to reclaim her power and overturn the order that tried to bind her.