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.
We're going to be together from now on,
so I need to make that clear.
Da wir ja nun Seite an Seite bleiben,
muss das doch klar sein.
Tiene que quedar claro
si no vamos a separarnos.
Tiene que quedar claro
si no vamos a separarnos.
Pour bien faire comprendre qu’à dater
de ce jour, on sera toujours ensemble.
Da ora in avanti staremo sempre insieme,
ho pensato fosse meglio chiarirlo.
Estaremos juntas a partir de agora, 
então preciso deixar isso claro.
Теперь мы всегда будем вместе, 
и лучше сразу всё прояснить.