Diary Of A Geno Sans: Aftertale (Alternate Universe Book 1)

Have you ever wondered what happens to Sans after the Genocide route?

Geno Sans(also known as Aftertale Sans), the only survivor of the Genocide, is now stuck in the void with Frisk. He has narrowly escaped death a whole 536times and lost his lovely brother, Papyrus to Chara.

The clock is ticking; can Geno save his timeline by stopping Chara? OR will Geno die perpetually in the void with Gaster?