The Demon King Gets a New Job: The Dean Teaches Me to Destroy the World

I am the most shameless Dark Lord in history, and I moonlight as a star lecturer at a dragon-slaying cram school. One day, after getting mobbed by heroes, my soul transmigrated, and I opened my eyes to find myself a straight-up good-for-nothing with all F's at the most cutthroat academy in a magic civilization. Just as I was preparing to keep my head down and play dead to survive, the school broadcast suddenly announced with great enthusiasm:

"Congratulations! You have activated a hidden quest: Heir to the Ultimate Villain's Legacy!"

Before I could finish laughing, the legendary paladin dean who had sealed me away pushed open the door, eyes burning as he pulled out a lesson plan.

"First, I'll teach you how to destroy the world with style..."

Me: "...Wait, is villain training really this hardcore these days?"