The Strongest Gatekeeper of the Demon King’s Castle

There is a story that has only been heard in rumors.

Countless heroes have drawn their swords and set out for the Demon King’s castle in order to defeat him, but none were ever able to slay the Demon King.

Some say they couldn’t even set foot in the castle.

The bodies of those who returned as cold corpses bore a single word, written in what was believed to be the ancient language of the demons.

[Return] -Destination Error-

Many wizards of the Magic Tower racked their brains to decipher the meaning of the word…

But no one could figure out what the word on the bodies truly meant.