Paying Back What's Owed - Devilgram
Leviathan comes back and demands Belphegor to open the door and give him Mammon so he can shake him down from his money. Despite Mammon's pleas, Belphie opens the door and Levi lashes at Mammon. Belphie however asks him to wait and give Mammon a bit more time. He reasons that Mammon doesn't have money anyway so shaking him down won't have any sensible results but tire him. Since Levi hates overexerting himself, Belphie manages to convince him to give up for now. Levi sets a deadline of one month, and Belphie promises to help him beat Mammon up if Mammon doesn't pay back the money within that time. With this, as Belphie sees it, they're even and he paid back Mammon for that one and only time when Mammon helped him.