The year is 2099, Shinjuku City. The legendary Demon Lord Beltre has reappeared in this future city that has achieved ultimate development. The glorious prosperity of the giant city-state and...... the terrible "darkness" hidden behind the scene. In order to rule the new world, the Demon Lord is moving into the future! Was serialized online on Kadokawa Shoten's Shōnen Ace Plus from November 5, 2021 to 2022, before being removed from the website for unknown reasons.