"You don't know where you come from, and you don't know where you are going. In the depths of the seven-layered bloody gate in the sky, can you find everything you have lost?"
On that afternoon in 2020, the red door replaced the sun, and an indescribable existence descended on human society. In the same year, all satellites lost communication signals, all ships leaving the port lost their way home, and a large number of people disappeared in the bloody dusk, and you happened to be one of the lucky ones.
