Lucifer is now up against the Demon Lord of Sloth, Belphegor. Belphegor gathers her followers online, working with Mammon. Belial asks Belphegor to put an end to Lucifer once and for all. Lucifer ends up getting sucked into Belphegor's game, along with Maria and Levi. With a battle for the virtual world ongoing, and tensions building between Maria and Lucifer, just what will happen?
The Fourth Sin, the Demon 
Lord of Sloth, Belphegor.
Die vierte Sünde, Dämonenfürst
der Faulheit, Belphegor.
Cuarto Pecado,
Demonio de la Pereza, Belfegor.
Cuarto Pecado,
Demonio de la Pereza, Belfegor.
Tu es le quatrième péché,
Belphégor la paresseuse !
Il Quarto Vizio, 
la Potenza Demoniaca dell'Accidia, Belphegor.
O Quarto Pecado, a Rainha Demônio 
da Preguiça, Belphegor.
Одна из семи смертных грехов, 
Воплощение Лени — Бельфегор.