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.
Onee-sama, you're going to stand 
on top of the Mortal Sins.
Mein Herzchen, du wirst
den Todsünden vorstehen.
Estaremos en la cima
de los Pecados Capitales.
Estaremos en la cima
de los Pecados Capitales.
Même les démons des péchés capitaux
ne pourront rien contre toi.
Mia Signora, sono sicura che arriverai
a dominare su tutti i Vizi Capitali.
Onee-sama, você ainda será a líder 
dos Sete Pecados Capitais.
Теперь вы должны возвыситься 
над всеми смертными грехами.