Demon Lord 2099 summary:

The winner of the 33rd Fantasia Award, a cyberpunk fantasy, has been adapted into a manga with stunning artwork!In the year 2099 of the Integrated Calendar, in the city of Shinjuku, a city that has reached the ultimate pinnacle of development, the legendary Demon Lord Veltol returns. Amidst the splendid prosperity of the colossal city-state lies a brutal 'darkness' concealed beneath the surface. With the intention of dominating this new world, the Demon Lord rises to action within the boundless future!