The visitor who came looking for the Nightmare Demon King was none other than Lucifer, a Demon King of Hell.
Sensing Lucifer's magical fluctuations, the Nightmare Demon King transported him into his palace and asked in some surprise, "Lucifer, you've always valued your dignity above all else. Why are you sneaking around this time?"
"Because I'm afraid the Mechanical Demon King will notice, of course. That fellow is definitely watching us, just as we're watching him."
Lucifer removed the cloak that concealed his presence and got straight to the point. "Nightmare Demon King, do you want to defeat the Mechanical Demon King?"
"Isn't that a stupid question?"
"Get to the point," the Nightmare Demon King snapped. "I've been refining a treasure lately. I don't have time for your nonsense."
Lucifer didn't mind. He asked, "Have you heard of the Serpent?"
"The Serpent, the God of Fear?"
"Of course I have," the Nightmare Demon King said. "I've even clashed with him. After all, we both draw our power from the fear force.
"The Serpent is Odin's older brother and the former God King of Asgard. Odin overthrew him and sealed him beneath Earth's Pacific Ocean.
"As for the exact reason, I'm not sure. Back then, nobody expected Odin to rebel."
"The exact reason doesn't matter. What matters is that the Serpent hates Odin to the bone. And Odin's daughter Hela hates him just as much."
Lucifer smiled. Uninterested, the Nightmare Demon King said, "So what? Lucifer, I'm not interested in Odin.
"Come to think of it, Odin hasn't appeared in years. Apparently, he's fallen into Odin Sleep and is half dead."
"That's just a cover. Odin has been living on Earth all along. He's a staunch ally of the Mechanical Demon King."
"Knowing the Mechanical Demon King, he'll definitely help if