Story cover for Undertale: Heartlines by Known_Nuisance
Undertale: Heartlines
Known_Nuisance
  • WpView
    Reads 4,788
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    Votes 253
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    Parts 51
  • WpHistory
    Time 14h 18m
  • WpView
    Reads 4,788
  • WpVote
    Votes 253
  • WpPart
    Parts 51
  • WpHistory
    Time 14h 18m
Known_Nuisance
Complete, First published May 21, 2025
Mature
adventurecharadeltarunefemalefriskfriskfriskxocfriskxreadermalereaderreaderreaderinsertromanceslowburnundertaleundertaleauundertaleheartlinesxreaderâu
Asher has spent years keeping his distance at the orphanage. Quiet, guarded, and alone by choice. That is, until Frisk arrives: all scraped knees, stubborn smiles, and a heart too big for her own good. What begins as a wary friendship slowly becomes the one thing they both hold onto.

But when a series of events leads them to the edge of Mt. Ebott, they'll discover that falling together is only the beginning.
All Rights Reserved
adventurecharadeltarunefemalefriskfriskfriskxocfriskxreadermalereaderreaderreaderinsertromanceslowburnundertaleundertaleauundertaleheartlinesxreaderâu
Table of contents

51 parts

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Slide 1 of 10
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Destiny's Link (Female Chara x Male Reader)

67 parts Complete

(Disclaimer : Badly written English will be in the story.) Frisk freed the monsters at once, but there's still someone underneath that huge mountain. Frisk also freed that someone, promising her that life will be better at the surface, and whatever things the future holds from the girls, Frisk will be the sister Chara always needed. And at the first day at the new school, the sisters met someone ... special, at least that's what Chara feels. Story started the 02/10/2022. Story ended the 03/01/2023. Inspiration taken from : Fallen Determination by Red Knife

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