Totsuka Maria was praying in a chapel at Seiseki Girls' Academy when a black cross comes falling from the sky. On that cross, was a fallen angel, bearing the sin of pride, Lucifer. Maria attempt to tend to the angel, but the floor falls out and she disappears. Lucifer finds herself in the depths of hell, and runs into the Demon Lord of Envy, Leviathan.
You think you could sit at the 
head of the Seven Mortal Sins?
Glaubst du, den sieben Todsünden
vorstehen zu können?!
¿Crees que puedes controlar
a los Siete Pecados Capitales?
¿Crees que puedes controlar
a los Siete Pecados Capitales?
Céder le trône des sept péchés
à quelqu’un comme toi ?
Davvero pensi di poter sedere
sul trono dei Sette Vizi Capitali?
Achou mesmo que iria domar 
os Sete Pecados Capitais?