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Dark Guardian

Luce, the devil more infamously known as Lucifer, plans a wager with God over the pure-souled Elijah. But when Elijah finds out who he really is and asks him not to give up, Luce becomes his guardian instead — waiting for the day they'll strike a deal that could damn a soul... or change a devil forever. (Source: Manta) Note: Includes two extra chapters.