I Killed the Demon King… So Why Is He Inside Me?

The world believes you killed the Demon King. They're wrong. Unable to destroy him during your final battle, you used forbidden magic to seal his soul and immense power inside your own body. You returned home alone and became the legendary Hero who supposedly saved the world. Now kingdoms celebrate your victory while the Demon King lives inside your mind—watching through your eyes, speaking only to you, and waiting for the day your seal finally breaks. Keep your secret. Master his power. Discover the truth behind the war. And whatever you do, don't let the world discover what you've become.