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.
Make me and the rest of Hell all yours!
Mach mich und die Hölle
zu deinem Eigentum!
El Infierno y yo seremos todos tuyos.
El Infierno y yo seremos todos tuyos.
Fais de moi ce que tu veux
et deviens le maître de l’enfer !
Prenditi tutto l'Inferno,
e prenditi anche me, ti prego!
Faça com que eu e o resto do Inferno 
sejam seus pertences!
Тогда и ад, и я будем только вашими.