When the world's top VR game merged with reality, everyone awakened as their in-game avatars. For salaryman Park Hoyeol, this is a nightmare. He’s stuck as Valerius, the over-the-top demon hunter he created in middle school—a class everyone mocked. But as demonic portals tear open across the globe, Valerius's 'useless' abilities reveal a terrifying power that only works on demons. Now, the world’s only demon hunter must embrace his cringey past to become its savior. But what happens when the demons discover the secret behind his strength?