Axetale Sans is transported into the earlier undergroundmby unknown means in Frisks place and has to decide to trust or kill to survive, the Hunger ever steadily gnawing at his bones.
"You've grown up... A little too much, kid."
"It's been a while... Sans."
It's been 8 years since Frisk had fallen into the underground. 8 years since she left that place. Leaving all she ever wanted behind, she decides to re-visit the place where she first fell.