Kibitsu Cho, who died from overwork at an exploitative company, is reincarnated as an ultimate android in the world that followed.

In a future world where humanity has perished, the ecosystem has changed, and monsters swarm, Cho utilizes his overpowered capabilities and advanced technology from the past, freely developing his surroundings as he pleases while enjoying a carefree life as a recluse.

In a world where civilization has crumbled and reverted to the wild, he built a strikingly artificial fortified city, reveling in an existence of ease.

Then, humanity—supposedly extinct—appeared.

He did not know.

That encounter would lead him down the path to becoming a "Demon Lord."

"All I'm doing is living as a recluse, though..."

This story depicts the life of Kibitsu Cho, a man feared in later histories who, for some reason, came to be known as the "Demon Lord."

～ARKLESS　EP.Ⅳ～