The world of Death Stranding is crafted with close attention to detail, depicting the horrors of the living world becoming entangled with an afterlife known only as The Beach: a liminal space that everyone enters after death.
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Throughout the game, players will embark on a journey with Sam 'Porter' Bridges, a delivery man tasked with reconnecting the country of America after a series of apocalyptic events related to The Beach have destroyed conventional society and left people disparate and isolated.
Without the full context of the narrative or surrounding world-building, it would be fair to assume that everyone in the game is just really sad. While that's still partially true, there's also a needlessly complicated reason behind all the tears shed in Death Stranding: Chiral Allergies.
Much of the crying in Death Stranding is just a slightly more complex version of the kind of allergies many people experience. Instead of being allergic to cats, dust, or tree pollen, Sam 'Porter' Bridges and many of the primary characters have an allergic response to something called Chiralium.
Chiralium comes in many forms in the Death Stranding universe: it's an ore, an energy source, and also a substance contained within the BTs ('Beached Things') that come from beyond the world of the living.
Essentially, Chiralium is a substance that makes up the afterlife known as The Beach, which prior to the beginning of Death Stranding, has begun to appear in the world of the living in great abundance.
Chiralium is responsible for many of the strange phenomena that can be observed in the world of Death Stranding. From the time-advancing effects of timefall rain to the voidouts
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