There's a Mole! Terminate Transaction

"An Youzai, as a person from the Demon Realm, why do you not kill people, set fire, eat, drink, whore or gamble, but why do you hang out with the enemy's adventurers all day long?" "I'm just looking for an opportunity to trap them and kill them!" "Is this exciting? What is the ultimate goal?" "Of course it is to eliminate adventurers who may threaten the life of me, the Demon King, in the future." This is the story of a high school student who travels to another world to become a demon, activates the inner ghost system, and then goes undercover to join the Adventurers' League. Eventually, the other world is turned upside down and everyone regards the devil as their lord! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.