Special thanks to @bence1114 for this contribution, and also helping out with the thumbnail! Seriously, he's amazing, go check him out!
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Branch 2 (titled "The Underground Milita") details an ending where the human stops their massacre after their confrontation with Sans in Snowdin out of *fear*. They simply run from that point on, hoping to get out of the Underground as quickly as possible. Only when they can’t run, they slash their way through. After their departure, seeing the damage the human caused, monsterkind starts preparing for war against humanity; with Queen Undyne as their leader. Will monsterkind's resolve falter, when a new human falls? 
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We have a Discord server, come say hi! - discord.gg/hy4B74jBzq

Disbelief: Aftermath [Branch II] OST - Our Story So Far... (by Why_Bence)

account 4

hi, im chungus the lesser, an evil enby who seeks to steal your soul
hav some muosic :thumbsuop\\\:

hi i jesus rivera here i put other thing like forgotten, old projects and other music i did

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 II] OST - Our Story So Far... (by Why_Bence)

UT DISBELIEF: Aftermath