Special thanks to @moonstrikefour for this contribution!
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Branch 1 (titled "The Divided Underground") details an ending where the human abandons their plans of genocide after their confrontation with Sans in Snowdin. They treat everyone they meet from that point onward with kindness; leaving monsterkind divided on their opinions about humans. With tension among monsterkind rising day by day, and with Queen Undyne's attempts to reunite monsterkind continuously failing; how will the underground react to a new fallen human?
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Disbelief: Aftermath [Branch I] OST - Their Story So Far... (Contributed by MoonStriker)

Disbelief: Aftermath is a series of Undertale AU’s placed after the events of Undertale: Disbelief, in which a new human falls down, after Frisk’s rampage through the underground. 
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In Disbelief's original story; the human continues their massacre; completing their genocide run when they kill Papyrus. But what if they didn't? What would the fate of the Underground be if the human took a different course of action after Sans' death, and created new neutral endings? This is what Disbelief: Aftermath hopes to answer.
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Disbelief: Aftermath is by @shinyemerrald
Undertale Disbelief is by @flamesatgames

Disbelief: Aftermath [Branch I] OST - Their Story So Far... (Contributed by MoonStriker)

UT DISBELIEF: Aftermath