There's a Mole! Abort the Deal

"An Youzai, you're a demon, so why don't you kill, loot, drink, gamble, or chase women? Why do you spend all day hanging out with adventurers from the opposing side?"

"I'm acting as a spy, waiting for a chance to take them out!"

"Isn't that exciting? What's your ultimate goal?"

"To wipe out the adventurers who might threaten my life as the Demon King in the future, of course."

A high school student transmigrates to another world and becomes a demon. After activating the Spy System, he goes undercover in the Adventurers' Alliance and eventually turns the other world upside down, until everyone puts demons above all else!

This novel and its characters are purely fictional. Any resemblance is purely coincidental. Do not imitate.