Synopsis: The Forgetful Dark Lord

The most powerful demon ruler, the Demon King, was punished by God for his rebellion. As punishment, he lost his prized possession- his demon horn. To retrieve it, he searches for the "Princess of Hell" to partner with him in cleansing 100 malevolent spirits that reside in the human realm. But as he begins this quest, he faces a dilemma- will he be able to absolve his demon followers of their sins, even if it means betraying them in the process? Additionally, there's an underlying issue- why is the Demon King so desperate to regain his horn? As it turns out, he fears losing his memories without it.