Toaru Hikuushi e no Tsuioku - Chapter 5

Ancient existences wake up in the abyss, demons whisper in people’s ears, unknown horrors erode the spirit, and madness breeds in the darkness of people’s hearts.

But it is not only darkness that descends on this world.

There are heavily armed dark knights walking in the dark to judge crimes; tight-fitting supernatural beings wandering between buildings to act as friendly neighbors; The impossible god on earth, the “S” symbolizing hope shines like the sun on his chest…

No one could have imagined that behind all of them, there was just a player sitting in front of a computer screen holding a keyboard and punching hard.

- Description from novelbuddy

The objective was the World Domination.

108 Demons and their Dungeons descended upon the land as they battled each other to become the Strongest Dungeon Master.

Isaac Constantine, a Demon Baron who managed to survive until the end of the game, only to meet betrayal that lead to his death.

Just as he thought it was over, he received a second chance

[Artefact Sand of Time has been activated.]

[Players can restart the game.]

[Synchronizing…]

[Displaying status]

[Isaac Constantine - Rank 99]

The battle between Dungeon Masters has restarted!

With a thirst for revenge, Isaac swore to create the best Dungeon and the Strongest army to win the game. Demons, Monsters, Superhumans even God himself will know his name.

Follow Isaac's story as he Rebirth to become the strongest Dungeon master

This story is centered around the man named Yi Ji-Hyuk, who has spent 1000 years in a Medieval Western fantasy-like world before returning back to the modern-day Earth. When he returns, he finds that his home is facing monster threats, and that humans with superpowers have appeared to protect the innocent people of Earth.