Doomsday Noon

After the apocalypse, due to the discovery of new energy [nuclear crystals], traditional shelters gradually developed into small towns, urban areas in the new world... And even metropolises that were as prosperous as the old world. There are maze-like complex underground fortresses and nuclear-powered cities suspended in the air. Boxers wearing mechanical prostheses sweat and blood, engaging in hormone-exploding death matches and high stakes underground. The virtual singer projected into the city in the sky sings ancient ballads with artificially synthesized natural voices, making the entire city seem like a mirage. Prosperous and decadent, gorgeous and decayed. This is the best of times and the worst of times.