Paradise Is Coming

After a mysterious disaster known as the "Doomsday", the prosperous world built by mankind through three industrial revolutions disappeared without a trace overnight. More than 90% of humanity has been killed by the apocalypse, and the remaining survivors can only linger in the wasteland. Just to survive, they need to do their best. Rebuilding their former home is simply a fantasy. However, there is a song that is passed down by word of mouth among everyone: "A paradise without hunger and disease, without disasters and dangers exists, and it will surely come after humans receive baptism." Will paradise really come?