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 is always doing 
pervy stuff with Levi!
Mein Herzchen macht immer
Sauereien mit ihrer Levi!
¡Siempre hace cosas sucias conmigo!
¡Siempre hace cosas sucias conmigo!
Lucifer m’a déjà
comme esclave sexuelle !
Queste cose la Mia Signora le fa solo con me!
É sempre comigo que a Onee-sama 
faz essas coisas depravadas!
Ведь всякие развратности сестрица делает 
только со мной.