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.
Did you forget just who stands 
on top of the Mortal Sins?
Hast du vergessen,
wer den Todsünden vorsteht?
¿Olvidas quién está
sobre los Pecados Capitales?
¿Olvidas quién está
sobre los Pecados Capitales?
Dois-je te rappeler
qui commande ici ?
O hai forse dimenticato
chi è a capo dei Sette Vizi Capitali?
Já se esqueceu quem 
lidera os Pecados Capitais?
Не забыла, кто стоит 
во главе смертных грехов?