Maria is glad she gets to see Lucifer again, believing that she's an angel, and then has her heart stolen by the Demon King. Lucifer forces Maria to follow her and lets her live a life of luxury. Meanwhile, Leviathan, who has strong feelings for Lucifer starts to get jealous over Maria because Lucifer won't pay any attention to her.
Onee-sama, why do you care so much about her?
Mein Herz, was findest
du nur an ihr?
Señorita, ¿por qué te importa tanto?
Señorita, ¿por qué te importa tanto?
Lucifer, pourquoi
tu te préoccupes tant de son sort ?
Mia Signora, si può sapere
perché tieni così tanto a quella?
Onee-sama, por que 
se importa tanto com ela?
Сестрица! Почему вы так заботитесь о ней?