Applying for a Job at Hogwarts, but the System Says It’s the Infernal Royal City

(Blind System + cunning with a contrasting side + Demon King's Throne + no female lead) Eris was stunned. The System had clearly said it would take him to Hell to make a name for himself, but instead he'd ended up in the Harry Potter world. The System insisted that Hogwarts was Hell's royal capital. Dumbledore was Satan, Lord of Hell; Grindelwald was Lucifer, Lord of the Abyss; and Voldemort was the Demon King of Greed. The heads of the four houses were all demon kings too: McGonagall was the Demon King of Envy, Snape the Demon King of Sloth, Flitwick the Demon King of Wrath, and Sprout the Demon King of Gluttony. Even the young wizards had all transformed into demons of various kinds. This was a different Hogwarts. This was Eris's demon lair!