In a forgotten dungeon ruled by neglect and decay, the Final Boss armor of Demon King Astal remained untouched for over 150 years.

Until someone possessed it.

A frustrated gamer, who quit a broken dungeon master simulation, suddenly awakens inside the empty armor of the very Final Boss he once defeated in-game.

No body. No face. No voice.

Just armor.

Trying to avoid attention, he quietly moves through the dungeon in secrecy, hoping to survive without triggering anything dangerous.

But the dungeon is no longer the same world he left behind.

After 150 years of silence, the goblin Jugrak recognizes the armor.

And everything changes.

Ancient monsters begin kneeling.
Forgotten factions awaken in loyalty.
Holy attacks meant to destroy evil shatter without effect.
And adventurers invading the dungeon tremble at the “return” of the Demon King.

One misunderstanding leads to another, until an entire army of monsters begins preparing for war in the name of their returned master.

Meanwhile, the man inside the armor has only one thought:

“I just wanted to quit the game…”

But now, he has become the symbol of an empire that should no longer exist.

And the dungeon believes,

its king has returned.