Spirit Card Era: I'm Really Not the Demon King

In the Age of Spirit Cards, humanity has fallen into decline while all the other races rise. From the start, he gets cornered by a Demon King. To stay alive, he has no choice but to borrow the Demon King's authority and impersonate him.

He never expected that once he put on the Demon King’s hat, he wouldn’t be able to take it off.

As humanity allies with the major races and raises a vast army to crush him, he finally loses his temper, drops the act, and wipes out the entire coalition with a single palm strike.

Enough pretending. I’m the Demon King.