>>716078972
"The Beach" is a plane between the world of the living and the dead. Dead people appear on The Beach and they walk through the sea to reach the afterlife.
A cataclismic event takes place: some dead people are "stranded" on the beach. They manifest in our world and try to reach for their old bodies or the bodies of living things in a desperate attempt to come back to life. When they enter in contact with a body, they cause a gigantic explosion similar to a nuclear explosion. This event is called the "Death Stranding" because the death are stranded on the beach.
The Death Stranding triggered a change in the world: rain now causes things to age and die rapidly and a new kind of mineral is discovered, chiralium, which has mysterious proterties.
This rain and the beached things, BTs, caused the surface to be extremely dangerous for people so the survivors went to hide and now live in shelters under the ground. Lost countries in the world including the USA are devastated and don't exist anymore.
The main character, Sam, has the weird ability to return to his body from the beach when he dies without triggering an explosion, essentially making him immortal. He is tasked by the last president of the USA to unite all the shelter-cities through the Chiral Network (a kind of physical internet powered by Chiralium which allows people to share information and print physical objects) to create the UCA: the United Cities of America. A new nation.
So he goes throughout the continent uniting and helping people with the help of BB, a fetus inside a pod. BBs are the unborn babies from mothers who died before they could give birth. Since BBs where not born and cannot be born, they can be used to detect and see BTs, as they're both beings that are stranded between the Beach and the world of the living.
That's basically it.